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Sociology and Anthropology, Genetics, Uncategorized

The Genetic Code and Gene Regulation: How Cells Read, Control and Use DNA

doctorsrevision@gmail.com / September 22, 2026

The Genetic Code and Gene Regulation: How Cells Read, Control and Use DNA The genetic code is the rule that converts a nucleotide sequence in messenger RNA into an amino-acid sequence. Gene regulation determines when, where and how strongly that information is used. Together they explain how one genome produces many specialised cells and why abnormal regulation causes developmental disease, endocrine disorders, immune disease and cancer. Why this topic matters: a patient may have a normal gene sequence but disease because the gene is not switched on, is expressed in the wrong tissue, produces unstable RNA, translates inefficiently, or makes too much protein. 1. The central dogma and its limits In most human cells, information flows from DNA to RNA to protein. Transcription copies DNA information into RNA; translation reads mRNA codons to build a polypeptide. This is not a claim that every gene produces protein—some genes produce functional RNA—and it does not mean regulation occurs at only one step. Information flow DNA sequence → transcription initiation → pre-mRNA → 5′ capping, splicing and polyadenylation → mature mRNA → ribosome reading codons → polypeptide folding and modification → functional product and phenotype. 2. What the genetic code is The code is read in non-overlapping triplets called codons. Each codon contains three mRNA bases and specifies one amino acid or a stop signal. The code is degenerate because several codons can specify the same amino acid, but it is not ambiguous: a particular codon normally has one meaning in the standard code. AUG usually acts as the start codon and also encodes methionine. UAA, UAG and UGA are stop codons. The reading frame is established at initiation; shifting it changes all downstream codons. 3. Properties of the code Property Meaning Clinical relevance Triplet Three bases form one codon Insertions/deletions not divisible by three cause frameshifts. Degenerate Several codons may specify one amino acid Some substitutions are synonymous, but may still affect splicing or expression. Nearly universal Most organisms use the same code Allows recombinant DNA and gene-expression systems. Non-overlapping Each base is read in one codon within a frame A frameshift changes the downstream message. Wobble Pairing at the third codon position is flexible Explains redundancy and some effects of tRNA abundance. 4. Transcription: making the RNA message RNA polymerase II binds a regulated promoter and synthesises a complementary RNA strand using the DNA template. Transcription has initiation, elongation and termination. Transcription factors determine which genes are accessible and help recruit or block polymerase. Regulation at transcription is powerful because it controls whether a message is made at all. A hormone-responsive promoter, for example, can rapidly increase the production of enzymes or receptors after a signal reaches the nucleus. 5. RNA processing and quality control 5′ cap: protects the transcript and helps ribosome recognition. Splicing: removes introns and joins exons. Alternative splicing: produces different transcripts from one gene. Poly-A tail: supports stability, export and translation. Nonsense-mediated decay: removes selected transcripts with premature stop codons. Errors in processing can produce disease even when the coding sequence is unchanged. This is why variant interpretation must include splice-site, deep-intronic, UTR and regulatory regions. 6. Translation: decoding mRNA at the ribosome Translation begins when the ribosome identifies the mRNA start region and assembles around the start codon. Initiator tRNA carries methionine. During elongation, tRNAs deliver amino acids, peptide bonds form, and the ribosome moves codon by codon. A stop codon recruits release factors rather than a tRNA. Translation may occur on free ribosomes or ribosomes attached to the rough endoplasmic reticulum. The destination of the new protein depends on signal sequences and determines whether it becomes cytosolic, nuclear, mitochondrial, lysosomal, secreted or membrane-bound. 7. Levels of gene regulation Chromatin level DNA packaging controls accessibility to transcription factors. Transcriptional level Promoters, enhancers, repressors and transcription factors control RNA production. RNA-processing level Capping, splicing, editing and polyadenylation determine the mature message. RNA-stability level Degradation determines how long an mRNA remains available. Translational level Ribosome recruitment and initiation determine protein production. Post-translational level Folding, modification, trafficking and degradation determine protein activity. 8. Transcription factors and regulatory elements Transcription factors are DNA-binding proteins that activate or repress genes. Activators recruit co-activators, mediator and chromatin-opening machinery. Repressors recruit co-repressors and chromatin-condensing enzymes. The same gene can respond to several factors, allowing integration of hormones, nutrients, stress, inflammation and cell identity. 9. Epigenetic regulation Epigenetic mechanisms change gene activity without changing the underlying base sequence. DNA methylation can reduce promoter accessibility. Histone acetylation often opens chromatin, while other histone marks can activate or repress depending on their location and context. Epigenetic regulation is essential in embryonic development, X-inactivation, imprinting, ageing and cancer. Clinical caution: “epigenetic” does not mean that a disease is imaginary or that a patient caused it through lifestyle. Epigenetic states are influenced by development, environment, inflammation, nutrition and disease, but causal interpretation requires evidence. 10. Non-coding RNAs Ribosomal RNA forms the structural and catalytic core of ribosomes. Transfer RNA carries amino acids. MicroRNAs bind target mRNAs and reduce translation or promote degradation. Long non-coding RNAs can influence chromatin, transcription and RNA processing. Non-coding RNA abnormalities are increasingly recognised in cancer and inherited disease. 11. Operons and eukaryotic regulation Many bacteria organise related genes into operons controlled by one promoter and regulatory region. This allows coordinated response to nutrients. Human genes are usually regulated individually through combinations of promoters, enhancers, insulators and chromatin domains, although shared regulatory networks coordinate pathways. 12. Mutations in the code versus mutations in regulation Variant location Likely first effect Example clinical reasoning Coding exon Protein sequence or termination changes Assess missense mechanism, nonsense-mediated decay or domain effect. Promoter/enhancer Amount or tissue of expression changes Normal protein sequence may be made in the wrong quantity. Splice region Abnormal mature mRNA RNA studies may clarify exon skipping or intron retention. UTR Stability, localisation or translation changes Protein may be reduced despite a normal coding sequence. Epigenetic control Gene switched off or misregulated Consider imprinting, methylation disorders or tumour silencing. 13. Gene regulation in cancer Cancer

Sociology and Anthropology, Genetics

Gene Structure and Function: From DNA Sequence to Clinical Phenotype

doctorsrevision@gmail.com / September 22, 2026

Gene Structure and Function A gene is not simply “a piece of DNA.” A typical human protein-coding gene is an organised sequence of regulatory and transcribed regions arranged along DNA. Its structure determines where transcription begins, which RNA is produced, how that RNA is processed, where translation begins and ends, and how much functional protein is made. Understanding this arrangement is the foundation for interpreting variants and explaining inherited disease. The central idea: DNA regulatory information controls transcription; the primary RNA transcript is processed into mature mRNA; the mRNA is translated into a polypeptide; and the polypeptide is folded, modified, transported and regulated to produce a phenotype. The gene map: read it from 5′ to 3′ A typical eukaryotic protein-coding gene 5′ side of DNA Region in order What it controls or produces Upstream Enhancers and silencers How strongly, where and when the gene is expressed Upstream Promoter and transcription-start site Recruitment of transcription factors and RNA polymerase II; beginning of RNA synthesis Transcribed 5′ untranslated region mRNA stability and efficiency of ribosome recruitment Translated Start codon Defines the beginning of the open reading frame Translated Coding exons separated by introns in the primary transcript Sequence that determines the amino-acid order after splicing Translated Stop codon Signals termination of translation Transcribed 3′ untranslated region mRNA stability, localisation and post-transcriptional regulation Downstream Polyadenylation and termination region Cleavage, poly-A addition and termination of transcription Important: the DNA gene contains exons and introns, but the mature mRNA does not normally contain the introns. The “coding sequence” is only the part translated into amino acids; the whole gene is larger because it also includes regulatory and untranslated regions. 1. DNA is the physical information store DNA is a double helix made from two antiparallel nucleotide strands. Each nucleotide contains phosphate, deoxyribose sugar and a nitrogenous base. Complementary pairing—A with T and C with G—allows information to be copied and repaired. The order of bases, not merely the amount of DNA, carries the instruction. A chromosome contains one long DNA molecule packaged around histone proteins. A locus is the physical position of a gene. An allele is one version of a gene. A genome includes coding genes, regulatory sequences, non-coding RNA genes, repetitive DNA, centromeres and telomeres. Therefore, a gene must be understood within chromatin and chromosome organisation. Clinical connection When a laboratory reports a variant, the doctor must ask: Which gene? Which transcript? Which genomic position? Which allele? Is it coding, regulatory or splice-related? What is the zygosity? How does it fit the phenotype and family history? 2. Regulatory DNA: deciding when a gene is used Enhancers An enhancer is a regulatory DNA element that can increase transcription when activator proteins bind to it. Enhancers may lie thousands of bases away, upstream, downstream or within an intron. DNA looping brings the enhancer-bound proteins into contact with the promoter through mediator and chromatin-associated proteins. Silencers and repressors Silencers reduce transcription when repressor proteins bind. Repressors may block transcription-factor binding, recruit enzymes that compact chromatin, or interfere with mediator and RNA polymerase. A pathogenic regulatory variant can therefore lower gene expression even though every coding exon is normal. Insulators and boundaries Insulators help separate neighbouring regulatory domains. They prevent an enhancer from activating the wrong promoter and help maintain tissue-specific expression. Disruption of a boundary can cause a normal gene to be expressed in the wrong place or at the wrong time. Do not call non-coding DNA “junk” automatically. A promoter, enhancer, silencer, splice element or untranslated region can be clinically important even when it does not encode amino acids. 3. The promoter and transcription-start site The promoter is the landing and assembly region for transcription. General transcription factors recognise promoter features and position RNA polymerase II. The transcription-start site is the nucleotide at which the initial RNA transcript begins. The promoter is not the same as the start codon: transcription can begin before translation begins. Promoter activity is tissue-specific. A liver cell, neuron and erythroid cell may use different transcription factors on the same genome. Promoter methylation or a promoter sequence variant can prevent the correct amount of RNA from being produced. 4. The 5′ untranslated region and start codon The first part of the transcript is the 5′ UTR. It is transcribed into RNA but not translated into protein. It can contain secondary structures and regulatory signals that affect ribosome scanning, translation initiation and mRNA stability. The start codon, usually AUG in mRNA, establishes the reading frame for the open reading frame. A mutation before the start codon may reduce translation. A new upstream start codon may divert the ribosome. A change in the start codon may abolish normal initiation or cause use of an alternative start site, producing a shortened or abnormal protein. 5. Exons: what remains in mature mRNA Exons are the segments retained after RNA splicing. Some exon sequence is untranslated, while coding exons contribute codons to the protein. Exons may encode catalytic domains, membrane-spanning regions, signal peptides, ligand-binding sites or protein-interaction domains. Exon boundaries matter because a variant can remove an entire exon, change the reading frame or alter a domain. Alternative exon choice also allows one gene to make different proteins in different tissues. 6. Introns: removed sequences with important functions Introns are transcribed into the initial pre-mRNA but removed during splicing. They are not simply useless gaps. Introns can contain enhancers, regulatory sequences, non-coding RNA genes and alternative exons. Their length and sequence can affect transcription and splicing efficiency. Splicing depends on the 5′ donor site, branch point, polypyrimidine tract and 3′ acceptor site. A variant near any of these signals may cause exon skipping, intron retention or activation of a cryptic splice site. The mature mRNA may then encode an abnormal protein or be destroyed by nonsense-mediated decay. How a splice variant causes disease DNA change weakens the normal splice signal. The spliceosome chooses an abnormal site. An exon is skipped or intronic sequence is retained. The reading frame may shift or a premature stop may

Sociology and Anthropology

Human Origins and Society: Evolution, Culture and Health

doctorsrevision@gmail.com / September 22, 2026

Human Origins and Society: Evolution, Culture and Health Human health is shaped by the interaction of evolution, biology, culture, social organisation, environment, economics and political power. Medical anthropology does not replace anatomy, physiology or pathology. It helps the doctor understand why disease is distributed unevenly, why patients interpret symptoms differently, why behaviours persist, and why treatment can succeed biologically yet fail socially. Learning objective: By the end of these notes, the learner should be able to explain human variation without racial stereotyping, link social organisation to disease risk, apply evolutionary reasoning cautiously, and use a structured social-cultural history in clinical practice. 1. What medical anthropology contributes Medical anthropology studies health, illness, healing and the human body in cultural and social context. It asks how people define normality, explain suffering, select healers, distribute care and respond to public-health messages. It examines both local knowledge and biomedical institutions, including how colonial history, migration and inequality shape health systems. 2. Human origins and the evidence for evolution Modern humans are one species with shared ancestry. Evidence for human evolution comes from fossils, comparative anatomy, archaeology, genetics and population studies. Evolution is a change in inherited characteristics across generations; it is not a ladder from “primitive” to “advanced” societies. All living populations are modern, and no population is biologically or intellectually superior. Clinical meaning Use ancestry only when it changes a specific clinical decision—such as a validated genetic test, a documented drug-response difference, or an exposure history. Never use skin colour, ethnicity or nationality as a shortcut for diagnosis, adherence, intelligence or pain tolerance. 3. Genetic variation, ancestry and race Most human genetic variation occurs within populations rather than between broad racial categories. Ancestry is probabilistic and may involve several geographic lineages. Race is a social classification that can still affect health because racism, discrimination, poverty, residence and access to care affect exposure and treatment. Separate biological evidence from social consequences. 4. Evolutionary forces Mutation: creates new genetic variants. Natural selection: changes the frequency of variants that affect survival or reproduction. Genetic drift: random change, especially in small populations. Gene flow: movement of genes between populations through migration and reproduction. Sexual selection: traits may spread because they influence mate choice or reproductive success. These mechanisms act over generations. They cannot be used to explain an individual patient without direct clinical evidence. 5. Adaptation and the human environment Humans adapt biologically and culturally. Skin pigmentation relates partly to ultraviolet exposure; body composition, lactase persistence and high-altitude physiology illustrate population adaptation. Culture is often faster than genetic change: clothing, shelter, cooking, sanitation, vaccination and technology alter exposure to disease. A trait that was useful in one environment may become harmful after migration or urbanisation. 6. Evolutionary medicine Evolutionary medicine asks why vulnerability exists. Examples include pathogen resistance after antimicrobial exposure, mismatch between modern diets and older metabolic adaptations, trade-offs in immune responses, and the protective value of fever or pain. These ideas generate hypotheses; they do not justify withholding treatment. Avoid evolutionary overreach: “It is evolutionary” is not a diagnosis. Do not use evolutionary explanations to excuse discrimination, dismiss mental illness, blame obesity, or deny the role of poverty, trauma, infection or medication. 7. Culture: learned systems of meaning Culture includes language, values, beliefs, customs, knowledge, rituals, food practices, gender expectations and ways of organising family life. It is learned and shared but not identical for every member. A patient may identify with several cultures, change practices over time, or reject a family tradition. 8. Socialisation across the life course Families and communities teach children what counts as pain, bravery, cleanliness, adulthood, illness and acceptable help-seeking. Adolescents may prioritise peers; adults may prioritise work and dependants; older people may hold decision-making authority. Ask who normally notices illness, who pays, who gives permission and who provides transport. 9. Kinship, household and social support Kinship systems influence caregiving, inheritance, residence, marriage, disclosure and consent. Household support can improve adherence, nutrition and follow-up, but family control can also restrict autonomy or conceal abuse. Involve relatives only with the patient’s permission, except where safeguarding or law requires action. 10. Gender, power and health Gender roles affect exposure to violence, occupational hazards, reproductive risk, nutrition, health information and control over money. Men may delay care because of norms around toughness; women may face limited decision-making power; gender-diverse patients may avoid services after discrimination. Ask privately about safety, reproductive goals and barriers. 11. Subsistence and livelihood Foraging, pastoralism, farming, fishing, informal work and urban employment produce different risks: zoonoses, pesticides, dust, heat, injuries, malnutrition, road trauma and infectious exposure. Occupational history should include tasks, protective equipment, seasonal work, livestock, water sources and travel. 12. Food, nutrition and the nutrition transition Food is biological fuel and social identity. Economic change can produce a double burden: childhood stunting or micronutrient deficiency alongside adult obesity, hypertension and diabetes. Dietary counselling should consider affordability, cooking facilities, fasting, food taboos, household allocation and locally available alternatives. 13. Migration, urbanisation and displacement Migration changes exposure to infections, stress, housing, occupation, diet and continuity of care. Do not assume a migrant has a particular disease because of origin. Ask about journey, residence, shelters, detention, language, trauma, immunisation, occupational exposure and interrupted medicines. Urbanisation may improve access to hospitals while increasing crowding, air pollution and food insecurity. 14. Social determinants and structural violence Education, income, land, housing, transport, clean water, sanitation, legal status and discrimination shape the distribution of disease. Structural violence means that social arrangements systematically expose some groups to preventable harm. A clinical prescription cannot solve every determinant, but the doctor can identify risk, document it, refer appropriately and advocate for safer systems. 15. Stigma, identity and the sick role Stigma can delay testing and disclosure in HIV, tuberculosis, epilepsy, infertility, mental illness, substance use, cancer and sexually transmitted infections. Explain confidentiality, use neutral language and ask what the diagnosis means to the patient’s family, work and future. Never equate a diagnosis with a moral failure. 16. Environment, climate and health Climate and ecology influence vectors, water

Medical Psychology

Concepts of Disease: Illness, Sickness and the Clinical Meaning of Health

doctorsrevision@gmail.com / September 22, 2026

Concepts of Disease: Illness, Sickness and the Clinical Meaning of Health Doctors do not treat laboratory results alone. They treat people who experience symptoms, interpret them through culture, and live with illness in families, workplaces and communities. The concepts of disease, illness and sickness provide a practical framework for history-taking, diagnosis, communication and ethical care. Key distinction: disease is the clinician’s formulation of pathology; illness is the patient’s lived experience of symptoms and suffering; sickness is the social role, expectations and consequences attached to being unwell. 1. Health, disease, illness and sickness Health is more than the absence of a named disease. It includes functional ability, participation, mental wellbeing and the ability to adapt to changing circumstances. Disease refers to abnormal structure or function identified through clinical reasoning, examination, investigations or recognised criteria. Illness includes pain, fatigue, fear, uncertainty and loss of normal activities. Sickness describes how family, employers, schools and communities respond to the person. 2. Why the distinction matters A patient may have disease without feeling ill, as in hypertension or early kidney disease. A patient may feel ill without a detectable structural lesion, as in many functional disorders. A patient can have severe social consequences despite mild pathology. A patient can carry a diagnosis but remain healthy in daily function. Failure to distinguish these concepts can lead to dismissing symptoms, over-testing, stigma or treatment plans that ignore what the patient needs to resume life. 3. Biomedical model The biomedical model explains disease through anatomy, physiology, pathology, infection, genetics, pharmacology and measurable mechanisms. It is essential for recognising emergencies and selecting effective treatment. Its limitation is reductionism: a test result may identify a mechanism without explaining why the illness began, why the patient delayed care, or what makes adherence possible. 4. Biopsychosocial model The biopsychosocial model integrates biological processes with emotions, behaviour, relationships, income, housing, work, education and culture. It does not mean that every disease is psychological. It means that every patient experiences disease in a body, mind and social environment. Clinical application For a patient with asthma, assess airway inflammation and inhaler technique, but also smoke exposure, housing, cost, health literacy, anxiety, work and ability to return for review. 5. Explanatory models of illness Patients and clinicians may use different explanations. Ask: What do you call the problem? What do you think caused it? Why did it begin now? What does it do? How severe is it? What treatment do you expect? What worries you most? Explanatory models may include infection, heredity, stress, food, pollution, spiritual causes, social conflict or traditional concepts of imbalance. 6. Symptoms, signs, syndromes and diagnoses Symptom: a subjective experience such as pain, dizziness or breathlessness. Sign: an observable or measurable finding such as fever, pallor or a murmur. Syndrome: a recognisable cluster of symptoms and signs. Diagnosis: a reasoned conclusion about the cause or nature of illness. Do not convert a symptom into a disease label prematurely. Use working diagnoses, state uncertainty and safety-net the patient. 7. Acute, chronic, recurrent and terminal illness Acute illness develops over a short period and may resolve, worsen rapidly or reveal chronic disease. Chronic illness persists and requires monitoring, prevention, rehabilitation and adaptation. Recurrent illness returns after improvement. Terminal illness involves progressive disease where goals may shift toward comfort, dignity and support. Explain the expected course honestly but compassionately. 8. Functional and medically unexplained symptoms Normal routine tests do not prove that symptoms are imaginary. Functional disorders involve altered regulation or processing of body systems, and psychological stress may amplify symptoms without making them unreal. Validate the experience, examine for red flags, explain the positive features supporting the diagnosis, avoid endless testing and arrange follow-up. 9. Pain and suffering Pain is a sensory and emotional experience influenced by tissue injury, nervous-system processing, fear, previous experience, sleep, culture and social support. Suffering is broader: it includes threat to identity, family role, future and dignity. Assess severity, function, meaning, risk of substance harm and the patient’s goals. 10. Behaviour, adherence and self-management Non-adherence is not a diagnosis of laziness. Explore cost, side effects, instructions, beliefs, transport, stigma, depression, memory, competing priorities and whether the treatment seems to work. Simplify regimens, use teach-back and agree on measurable actions. 11. Stigma and diagnostic labels Labels can unlock treatment but can also cause shame, discrimination, family rejection or loss of employment. HIV, tuberculosis, epilepsy, infertility, mental illness, obesity, substance use and cancer may be stigmatised. Use person-first language, protect confidentiality and ask how the diagnosis affects the patient’s relationships and safety. Never equate illness with moral failure. Addiction, obesity, sexually transmitted infection, mental illness and treatment delay require clinical assessment and support, not blame. 12. Culture, spirituality and traditional care Patients may combine biomedical treatment with prayer, herbal remedies, family advice or traditional healing. Ask without ridicule what has been used, the ingredients, dose, timing and perceived effect. Identify interactions and dangerous delay. Respect beliefs while clearly recommending urgent care when life or organ function is at risk. 13. The sick role Being sick can temporarily excuse normal duties and create an expectation of care, but the role differs by family and culture. Some people gain support; others are blamed, abandoned or expected to keep working. Ask about work, caregiving, finances, transport and who can help with medicines. 14. Diagnostic uncertainty and probability Early consultations often produce a differential diagnosis rather than certainty. Explain what is most likely, what dangerous alternatives are being excluded, what test results mean, and when the plan will change. Avoid false reassurance, but do not communicate every remote possibility in a way that causes unnecessary fear. 15. Doctor–patient relationship Trust improves disclosure and shared decisions. Introduce yourself, confirm identity, obtain consent, listen without interruption, summarise, acknowledge emotion and check understanding. Shared decision-making includes the best evidence, clinical expertise and patient values. 16. Practical consultation framework Clarify the patient’s main concern and functional impact. Explore the patient’s explanatory model and expectations. Assess biological danger signs and psychosocial risk. Explain the working diagnosis and uncertainty in

Sociology and Anthropology

Indigenous African Healing: Principles, Practice and Safe Clinical Integration

doctorsrevision@gmail.com / September 22, 2026

Indigenous African Healing: Knowledge, Practice, Safety and Clinical Integration Indigenous African healing is not a single treatment system. It is a diverse set of knowledge, skills, beliefs, social relationships and healing practices developed in different communities. It may include herbal medicine, spiritual care, prayer, divination, counselling, massage, bone setting, birth support, dietary advice and community reconciliation. Doctors need cultural understanding and scientific caution at the same time. Clinical principle: respect the patient and community; assess the treatment objectively; identify danger; prevent harmful delay; and provide evidence-based care without ridicule. 1. Meaning and diversity Knowledge may be passed through family traditions, apprenticeship, specialist healers, elders, religious institutions and community experience. A herbalist, traditional birth attendant, spiritual practitioner, bonesetter, diviner and community counsellor may have different training and responsibilities. Never assume that one practice represents all African cultures or that every healer makes the same claims. 2. Why patients seek indigenous healers Trust, language, proximity and lower direct cost. Respectful listening and attention to family, spiritual and social concerns. Availability outside hospital hours and in remote areas. Explanations that make sense of suffering and restore meaning. Previous poor treatment, discrimination or long waiting times in formal services. Belief that herbal or spiritual care is safer or more natural. Ask what the patient valued rather than assuming ignorance or rejection of medicine. 3. Explanatory models of illness Illness may be attributed to infection, heredity, diet, pollution, stress, social conflict, spiritual attack, ancestors, witchcraft, imbalance or loss of harmony. Biomedical and indigenous explanations can coexist. The doctor should understand the model because it predicts help-seeking and adherence, while still treating emergencies according to clinical evidence. 4. Types of practice Practice Possible purpose Clinical issues Herbal medicine Symptoms, chronic disease, prevention or cleansing Unknown dose, contamination, toxicity and interactions. Spiritual care Meaning, hope, prayer and social support Potential delay, coercion or harmful rituals. Bone setting Splinting and manipulation after injury Neurovascular injury, infection, malunion and delayed surgery. Traditional maternity care Pregnancy, birth and postpartum support Haemorrhage, sepsis, obstructed labour and delayed referral. Massage and topical care Pain, mobility and comfort Burns, infection, bleeding or worsening fracture. 5. Herbal medicines and pharmacology Plant products contain active chemicals, but activity does not guarantee safety. The same plant may vary by species, soil, season, storage and preparation. Adulteration with steroids, antibiotics or heavy metals can occur. Ask for the local name, ingredients, source, preparation, dose, route, frequency, duration and last use. If possible, ask the patient to bring the container or sample. High-risk combinations: unknown remedies with anticoagulants, insulin, antiretrovirals, antiepileptics, tuberculosis treatment, chemotherapy, anaesthetics, antihypertensives or medicines with a narrow therapeutic index. 6. Recognising toxicity Consider herbal or traditional treatment toxicity in unexplained jaundice, dark urine, renal impairment, bleeding, seizures, severe vomiting, hypoglycaemia, altered consciousness, rash, bronchospasm or sudden deterioration. Stop exposure when clinically appropriate, stabilise the patient, document the product and report suspected adverse drug reactions through the national system. 7. Spiritual and religious healing Prayer, ritual, confession and community support can reduce distress and strengthen coping. Ask whether the patient wants a trusted spiritual supporter involved. Consent is essential. Spiritual care becomes unsafe when it replaces urgent treatment, demands payment through coercion, encourages stopping medicines, uses violence or restraint, or exposes children and vulnerable adults to harm. 8. Bone setting and injury Assess circulation, sensation, motor function, skin integrity and compartment syndrome before and after any manipulation. Obtain appropriate imaging. Open wounds, severe deformity, absent pulses, neurological deficit, suspected compartment syndrome, dislocation or unstable fracture require urgent orthopaedic care. Explain that a familiar healer may be respected while the injury still needs hospital treatment. 9. Pregnancy, childbirth and newborn care Traditional birth support may provide companionship and practical help, but danger signs need immediate referral: heavy bleeding, convulsions, severe headache or hypertension, prolonged labour, obstructed labour, fever, malpresentation, fetal distress, retained placenta, reduced fetal movement, premature rupture with infection, or a sick newborn. Newborn breathing difficulty, poor feeding, hypothermia, jaundice in the first day, fever or seizures are emergencies. 10. Children and safeguarding Children cannot consent to harmful procedures. Assess nutrition, immunisation, growth, poisoning, burns, scarification, sexual abuse, restraint and delay in treatment. Explain danger signs to caregivers and document concerns. A child’s best interests override family pressure or healer authority. 11. Mental health and substance use Families may interpret psychosis, epilepsy, depression or substance dependence spiritually or morally. Listen to the explanation while assessing suicide risk, violence, delirium, intoxication, withdrawal and medical causes. Do not permit dangerous restraint, starvation, chaining or assault. Combine psychiatric care with safe family and spiritual support when the patient agrees. 12. Respectful clinical history “What do you call this problem?” “What do you think caused it?” “Which healer, remedy or spiritual practice have you used?” “What exactly was given or done, and when?” “Did you stop any prescribed medicine?” “What outcome are you hoping for?” “Who should be involved in decisions?” Ask privately when coercion, domestic violence, sexual abuse or financial exploitation is possible. 13. Shared decisions and communication Start with respect, not confrontation. Validate the patient’s fear or hope. Explain what is known, what is uncertain, what is dangerous and what treatment is essential. Offer safer alternatives: continue prayer as support while treating sepsis, retain family support while starting antimalarial therapy, or use physiotherapy after fracture assessment. Use teach-back and give clear return precautions. A useful sentence “I respect that this treatment is important to you. I am worried about this finding because it can damage the liver / delay delivery / worsen the fracture. Let us keep the support that helps you while we arrange the treatment that protects your life.” 14. Collaboration and referral Collaboration may improve trust and early referral when it is lawful, voluntary and patient-centred. Do not share confidential information without consent, pay referral commissions, endorse unsupported cures, or imply that every provider is regulated. Agree on danger signs and referral pathways with community partners where appropriate. 15. Research and evidence Traditional knowledge deserves respectful study, but anecdotes do not establish efficacy.

Medical Psychology

Culture and Its Impact on Health and Healthcare

doctorsrevision@gmail.com / September 22, 2026

Culture and Its Impact on Health and Healthcare Culture is the shared system of meanings, values, beliefs, language, practices and social relationships through which people understand life, illness, healing and death. Culture does not determine every decision, but it strongly influences how people explain symptoms, seek help, communicate distress, use food and medicines, and relate to health professionals. Learning objectives Define culture and health; explain cultural influences on illness beliefs and health behaviour; describe explanatory models, ethnomedicine, language and stigma; identify risks of cultural stereotyping; and provide culturally safe, respectful and clinically effective care. 1. Culture, society and health Culture is learned, shared, transmitted and adapted. It includes visible practices such as food, dress and ceremonies, and less visible assumptions about the body, family, gender, time, authority, pain and responsibility. A patient may belong to several cultural groups at once, including family, ethnic, religious, professional, generational and online communities. 2. Cultural concepts of health and illness Different communities may understand health as balance, strength, social harmony, spiritual protection, fertility, ability to work or freedom from symptoms. Illness may be explained through infection, heredity, environment, stress, social conflict, ancestors, spiritual causes or a combination. A doctor’s task is not to ridicule the explanation but to understand it, identify danger and build a safe treatment plan. 3. Explanatory models An explanatory model is the patient’s or family’s answer to: What is the problem called? What caused it? Why did it start now? What does it do? How serious is it? What treatment should be used? What is expected to happen? Asking these questions reveals beliefs that may affect consent and adherence. Area to explore Useful question Clinical value Cause “What do you think caused this problem?” Identifies beliefs, guilt, stigma and possible exposures. Expected treatment “What treatment were you hoping for?” Reveals expectations and opportunities for negotiation. Previous help “What have you already tried?” Prevents unsafe duplication and improves trust. Family meaning “Who else is concerned or involved?” Shows support, pressure and decision-making roles. Preferred explanation “How much detail would you like today?” Respects autonomy and information preferences. 4. Language and communication Language affects symptom description, consent, risk communication and safety-netting. Translation is not only word substitution; idioms, metaphors and culturally specific meanings matter. Use a trained interpreter when necessary, speak to the patient rather than the interpreter, use short sentences and confirm understanding with teach-back. Do not use children as interpreters for sensitive or complex information. 5. Pain, distress and emotional expression Culture may influence whether pain is openly expressed, minimised, attributed to a social or spiritual problem, or communicated through bodily symptoms. Avoid assuming that quietness means little pain or that dramatic expression means exaggeration. Combine the patient’s report with examination, function and risk assessment. 6. Food, diet and healing Food practices may be linked to identity, religion, pregnancy, illness, age and household roles. Some restrictions may cause malnutrition; others may support health. Ask what the patient eats, avoids, can afford and believes is therapeutic. Dietary counselling should be culturally acceptable, locally available and compatible with medical goals. 7. Family, gender and decision-making Some patients expect collective decisions; others expect individual privacy. Gender and age may determine who controls money, speaks for the family or gives permission. Respect the patient’s autonomy while safely involving relatives with consent. A family member’s presence must not prevent disclosure of violence, sexual health concerns, mental illness or other sensitive information. 8. Religion and spirituality Spiritual beliefs may provide hope, coping, community support and meaning. They may also influence refusal, fasting, blood-product decisions, end-of-life preferences or the use of prayer alongside treatment. Ask respectfully about spiritual needs and involve chaplaincy or a trusted leader when the patient requests it, without allowing spiritual support to replace urgent medical care. 9. Traditional and complementary healing Patients may use herbs, spiritual care, massage, traditional birth attendants or other healing systems. Ask openly and non-judgementally about products and practices, because some may interact with medicines, delay referral, cause toxicity or be beneficial for wellbeing. Document relevant use, provide risk information and seek collaboration where safe. 10. Stigma and culturally patterned illness Stigma may affect HIV, tuberculosis, epilepsy, infertility, mental illness, disability, cancer, sexual health and substance use. It can lead to secrecy, delayed care, violence and treatment interruption. Use person-first language, protect confidentiality and challenge discriminatory statements. Cultural humility requires ongoing self-reflection rather than claiming to “master” another culture. 11. Cultural competence and cultural humility Self-awareness: recognise personal assumptions, bias and power. Cultural knowledge: learn relevant histories and practices without treating groups as identical. Communication skill: ask, listen, clarify and negotiate. Respect: preserve dignity even when beliefs differ. Adaptation: modify explanations, timing, diet and follow-up when clinically safe. Humility: remain curious and let the patient be the authority on their experience. 12. Cultural safety in clinical care Cultural safety asks whether the patient experiences the service as respectful and free from racism, humiliation and coercion. It includes privacy, language access, appropriate consent, disability access, fair triage, respectful touch and protection from discrimination. A service may consider itself culturally competent while patients still experience it as unsafe; feedback matters. 13. Risks of stereotyping Stereotypes turn a population pattern into an assumption about an individual. Do not assume that every patient from a particular group refuses treatment, uses traditional medicine, wants family involvement or holds the same beliefs. Ask the individual and use clinical evidence. Culture should explain questions, not replace assessment. 14. Applying culture to common clinical situations Antenatal care Ask about food restrictions, birth preferences, family decision-making, traditional birth support and danger-sign knowledge. Mental health Explore local explanations of distress, spiritual support, stigma, safety and preferred forms of help. Chronic disease Adapt diet, medicines and follow-up to work, family roles, food availability and beliefs about long-term treatment. End-of-life care Discuss disclosure, family involvement, spiritual needs, preferred place of care and advance decisions respectfully. 15. A practical cultural assessment What language and form of explanation does the patient prefer? What does the patient think is happening and what caused

Sociology and Anthropology

Doctor–Patient Relationship and Clinical Communication

doctorsrevision@gmail.com / September 22, 2026

Doctor–Patient Relationship and Clinical Communication The doctor–patient relationship is the professional relationship in which a doctor and patient work together to understand illness, make decisions, provide treatment and promote health. It is built through trust, respect, competence, communication, confidentiality and shared responsibility. Good communication is a clinical skill, not an optional courtesy. Learning objectives Explain the meaning and importance of the doctor–patient relationship; describe models of the relationship; demonstrate a structured consultation; apply principles of consent, confidentiality and shared decision-making; manage difficult conversations; and identify barriers to effective communication. 1. Importance of the relationship A strong relationship improves history-taking, diagnostic accuracy, disclosure of sensitive information, adherence, satisfaction, safety and continuity. Trust makes patients more likely to report symptoms, ask questions and return when a condition worsens. A technically correct plan may fail if the patient does not understand it, cannot afford it or does not believe the doctor respects them. 2. Essential qualities Respect: recognise dignity, autonomy, culture and preferences. Empathy: understand the patient’s experience and communicate that understanding. Compassion: respond to suffering with a willingness to help. Honesty: communicate truthfully while remaining sensitive. Confidentiality: protect private information within legal and ethical limits. Competence: maintain knowledge, judgement, examination skill and referral awareness. Reliability: explain the plan, follow up results and keep promises. 3. Models of the doctor–patient relationship Model Main feature Strength and limitation Paternalistic Doctor decides what is best Useful in emergencies, but may restrict autonomy if used routinely. Informative Doctor provides facts and patient chooses Respects autonomy but may abandon a patient who needs guidance. Interpretive Doctor helps clarify values and options Supports personalised decisions and requires listening. Deliberative or shared Doctor and patient discuss evidence, values and preferences together Usually suitable for modern patient-centred care. Partnership model Both contribute expertise: the doctor knows medicine and the patient knows their life Promotes trust, adherence and continuity. 4. Structure of a clinical consultation Prepare: review available information, ensure privacy and reduce interruptions. Connect: greet the patient, introduce yourself, confirm identity and explain your role. Set the agenda: ask what brought the patient and what they most want addressed. Explore: begin with an open question, then clarify symptoms, concerns, ideas, expectations and effects on life. Examine and assess: explain what you are doing, seek permission and maintain dignity. Explain: give the working diagnosis and uncertainty in language the patient understands. Plan: discuss options, benefits, risks, costs, alternatives and follow-up. Close: ask the patient to repeat the plan, invite questions and explain danger signs. 5. Verbal and non-verbal communication Verbal communication includes word choice, pace, tone, questions, explanations and checking understanding. Non-verbal communication includes eye contact, posture, facial expression, distance, silence and attention to the patient’s emotional cues. Looking continuously at a computer can make a patient feel ignored. Explain when you need to document. 5.1 Open and closed questions Open questions invite the patient’s story: “Tell me what happened.” Closed questions clarify details: “Did the pain begin today?” Use open questions early and focused questions later. 5.2 Active listening Do not interrupt unnecessarily. Reflect key words, summarise, clarify contradictions and notice emotion. A pause may allow a patient to disclose important information. 5.3 Teach-back Ask the patient to explain the plan in their own words: “I want to be sure I explained it clearly—how will you take the medicine?” Teach-back checks the doctor’s communication, not the patient’s intelligence. 6. Empathy and responding to emotion Use the NURSE approach when appropriate: Name the emotion, Understand or acknowledge it, show Respect, offer Support and Explore the concern. “You seem frightened by the result” is more therapeutic than immediately changing the subject. 7. Informed consent Consent is a voluntary and informed agreement made by a person with decision-making capacity. The discussion should cover the nature and purpose of the intervention, expected benefits, important risks, alternatives, consequences of no treatment and the opportunity to ask questions. Consent is a process, not merely a signature. Assess capacity by checking whether the patient can understand relevant information, retain it long enough to decide, use or weigh it, and communicate a choice. Capacity is decision-specific and may fluctuate. In emergencies, follow applicable law and professional guidance. 8. Confidentiality and privacy Protect information spoken in the consultation, written in records, stored electronically and shared with other professionals. Discuss information in a private place, verify identity before sharing, secure records and avoid casual conversations in corridors or social media. Disclosure may be justified by patient consent, a legal requirement or a serious and proportionate risk of harm, according to applicable law and professional guidance. 9. Shared decision-making Shared decision-making combines best available evidence with the patient’s values, preferences, circumstances and goals. Present reasonable options, use absolute risks where possible, avoid coercion, and allow time for questions. Include cost, travel, work, family responsibilities, cultural values and expected effects on daily life. 10. Culture, language and health literacy Culture may influence explanations of illness, family roles, consent, pain expression, diet, traditional treatment and end-of-life decisions. Ask rather than assume. Use a trained interpreter when language limits safe care; do not rely on children for sensitive interpretation. Adapt explanations to the patient’s level of health literacy and avoid unexplained jargon. 11. Difficult consultations Angry patient Remain calm, listen without interruption, acknowledge the concern, set respectful limits and seek a practical solution. Do not argue or retaliate. Anxious patient Give time, explain what is known and unknown, identify the feared outcome and agree on the next step. Demand for antibiotics Explore the patient’s concern, explain likely cause and harms, offer symptom relief and safety-netting. Unrealistic expectations Clarify goals, explain limits honestly and offer achievable alternatives. 12. Breaking bad news Use a planned approach such as SPIKES: Setting and privacy; assess the patient’s Perception; obtain an Invitation to discuss detail; give Knowledge in small portions; respond to Emotions with empathy; and provide Strategy and Summary. Avoid false reassurance, excessive jargon and delivering serious news while standing at the doorway. 13. Communication about uncertainty and error Medicine often involves probability. Explain uncertainty honestly and

Sociology and Anthropology

Social Structures and Health

doctorsrevision@gmail.com / September 22, 2026

Social Structures and Health Social structures are the organised patterns, institutions and relationships through which society distributes resources, authority, opportunities, duties and risks. They influence who becomes exposed to illness, who receives protection, whose symptoms are believed, and who can obtain timely and effective care. Learning objectives Define social structure; distinguish status, role, institution, group and social stratification; explain how family, education, economy, politics, religion, gender and health institutions influence health; and apply structural analysis to clinical and public-health problems. 1. Meaning of social structure Social structure is the relatively stable pattern of relationships, rules and institutions that organises social life. It is not a physical object. It is seen in repeated patterns such as who controls land and money, who performs unpaid care, who makes decisions, who can access education, and how services are distributed. 2. Key concepts Status: a person’s social position, such as doctor, student, parent, elder or patient. Role: expected behaviour attached to a status. Institution: an organised system such as family, education, government, religion, economy or health care. Social group: people who interact or share an identity, purpose or experience. Norms: expected rules of behaviour. Values: shared ideas about what is important or acceptable. Stratification: the ranking of people into unequal social layers based on income, power, education, gender, ethnicity or other characteristics. 3. Social stratification and the social gradient Stratification affects exposure to hazards and access to protective resources. People at the lower end of the social gradient are more likely to experience unsafe work, poor housing, food insecurity, violence, stress and barriers to care. The gradient is not limited to the poorest group; health often improves step by step as social advantage increases. Structure Health pathway Example Economic system Determines income, employment and ability to afford essentials Loss of income causes missed medicines and poor nutrition. Gender system Shapes autonomy, workload, violence and reproductive decisions A woman may need permission or money to attend care. Education system Shapes literacy, opportunity and health information Low health literacy affects consent and medicine use. Political system Determines laws, services, social protection and resource distribution Unequal facility funding produces unequal outcomes. Health institution Shapes trust, quality, waiting time, safety and continuity Disrespectful care may cause future avoidance. 4. Family structure and health Families provide food, housing, emotional support, childcare, money, transport and decision-making. They also shape beliefs, gender roles, reproductive choices, discipline, diet and health-seeking. Family conflict, violence, neglect, substance use or exclusion can harm health. Doctors should ask who lives with the patient, who provides care, who controls money and who should be involved in decisions. 5. Education and social mobility Education is a pathway to employment, income, confidence, communication and health literacy. Schools can promote nutrition, hygiene, sexual health, immunisation and mental health, but school exclusion, unsafe schools, disability barriers and unequal quality can reproduce disadvantage. Education should not be reduced to individual responsibility; the quality and affordability of schooling matter. 6. Work, occupation and the economy Work may provide income, identity and social connection. Unsafe work can cause injury, occupational lung disease, poisoning, hearing loss, stress and musculoskeletal disease. Informal workers may lack insurance, sick leave or protection. Unemployment and insecure work may produce anxiety, depression, food insecurity and delayed care. Take an occupational history and consider the patient’s ability to follow a treatment plan while working. 7. Gender and health Sex-related biology affects some diseases, but gender is a social system of expectations and power. Gender influences exposure to violence, unpaid work, nutrition, reproductive decisions, access to money, occupational roles and willingness to seek care. Men may face pressure to avoid care or express distress through substance use; women may face restrictions on autonomy and a disproportionate care burden. Avoid stereotypes and assess the individual’s circumstances. 8. Religion, culture and social norms Religious and cultural institutions can provide support, meaning, ethical guidance and community resources. They can also influence beliefs about causation, contraception, mental illness, disability, death and acceptable treatment. Clinicians should ask what the patient believes is happening, what help has already been sought and what treatments are acceptable, while explaining danger signs and evidence-based care respectfully. 9. Politics, law and public policy Political decisions shape health through taxation, health financing, public transport, roads, water systems, education, housing, labour regulation, food safety, tobacco and alcohol control, refugee policy, disability rights and emergency response. Laws can protect health or create barriers. Health professionals contribute by documenting patterns, advocating for equity and participating in community and policy discussions. 10. Social capital and community participation Social capital refers to trust, reciprocity, shared networks and the ability to act together. Strong community networks can improve epidemic response, vaccination, sanitation, maternal referrals and support for chronic illness. Weak trust, exclusion, misinformation and stigma can reduce uptake. Community participation should be genuine; communities should help define problems and solutions rather than being treated only as recipients. 11. Social structures and mental health Chronic poverty, discrimination, displacement, violence, insecure housing and unemployment can create sustained stress and loss of control. These exposures may contribute to depression, anxiety, harmful substance use, trauma-related illness and suicide risk. Mental-health assessment should include social stressors, safety, support and access to protection—not only symptoms. 12. Social structures and disease patterns Infectious disease Overcrowding, water, sanitation, mobility, occupation, stigma and access to testing shape transmission and outcomes. Non-communicable disease Food systems, work, stress, tobacco marketing, transport and access to preventive care shape risk. Maternal health Gender power, income, transport, respectful care and referral systems affect antenatal and emergency outcomes. Disability Impairment becomes more disabling when buildings, transport, communication and attitudes exclude people. 13. Structural violence and stigma Structural violence occurs when social arrangements systematically expose some groups to preventable harm. Stigma can reduce employment, housing, relationships and healthcare access. Doctors should use person-first language, protect confidentiality, challenge discriminatory practice and ensure that clinical decisions are based on need rather than social status. 14. Applying structural analysis to a patient Describe the clinical problem clearly. Identify immediate biological and behavioural risks. Ask what family, institutional,

Sociology and Anthropology

Health-Related Behaviours: Acquisition, Maintenance and Modification

doctorsrevision@gmail.com / September 22, 2026

Health-Related Behaviours: Acquisition, Maintenance and Modification Health-related behaviour is any action or pattern of action that influences health, illness, prevention, treatment, recovery or quality of life. This note explains how behaviours are formed, why people maintain them, and how doctors can support safe and lasting change. Learning objectives Define health-related behaviour; classify protective, preventive, illness and risk behaviours; explain biological, psychological, social and cultural influences; apply major behaviour-change theories; and design a patient-centred behaviour-modification plan. 1. Meaning and importance Health-related behaviours include eating, physical activity, sleep, hygiene, sexual practices, tobacco and alcohol use, medicine-taking, immunisation, screening, seeking care, attending follow-up and responding to symptoms. Some behaviours promote health, some increase risk, and many have both benefits and harms depending on context. 2. Types of health-related behaviour Health-promoting behaviour: balanced nutrition, exercise, sleep, hand hygiene, breastfeeding and stress management. Preventive behaviour: vaccination, antenatal attendance, screening, safer sex, mosquito-net use and early testing. Illness behaviour: noticing symptoms, interpreting them, deciding whether they are serious and choosing where to seek help. Sick-role behaviour: accepting treatment, resting, following restrictions and cooperating with rehabilitation. Risk behaviour: tobacco, harmful alcohol use, unsafe sex, inactivity, unsafe driving and medicine misuse. 3. How behaviours are acquired Behaviour develops through observation, imitation, reinforcement, habit, emotion, knowledge, social expectations and the opportunities available in the environment. Children learn from parents and peers. Adolescents are strongly influenced by identity and peer acceptance. Adults may use behaviours to cope with stress, pain, loneliness or economic insecurity. 3.1 Learning and reinforcement A behaviour that produces a rewarding result is more likely to be repeated. Relief after taking a sedative, social approval after drinking, or immediate pleasure from sugary food can reinforce behaviour even when long-term health effects are harmful. Behaviour change therefore requires alternative rewards and practical coping skills. 3.2 Social learning People learn by observing role models and by judging whether they are capable of performing the behaviour. Confidence, or self-efficacy, is central. A patient who believes that exercise is impossible because of pain, poverty or lack of safety needs a graded and realistic plan. 4. Influences on health behaviour Influence Examples Clinical implication Knowledge and beliefs Perceived causes, benefits, risks and traditional explanations Correct misinformation respectfully and connect advice to the patient’s understanding. Emotion and mental health Stress, depression, trauma, anxiety and coping Screen for psychological drivers before labelling behaviour as non-compliance. Family and peers Support, pressure, modelling and stigma Involve supportive relatives with consent and protect confidentiality. Culture and religion Food rules, healing traditions, gender roles and beliefs about illness Use culturally safe communication and negotiate rather than ridicule. Environment and resources Food prices, transport, safe spaces, work schedules and medicine availability Make the plan achievable in the patient’s real setting. Health services Trust, waiting time, cost, communication and continuity Improve access and service experience, not only patient education. 5. Health Belief Model The Health Belief Model proposes that action is influenced by perceived susceptibility, perceived severity, perceived benefits, perceived barriers, cues to action and self-efficacy. A patient may not test for HIV if they feel not susceptible. A patient may delay hypertension review if the disease feels harmless. A reminder, family encouragement or a symptom can act as a cue. Transport cost, fear of stigma and side effects are barriers. Doctors should address each belief instead of giving a general lecture. 6. Theory of Planned Behaviour Intention is influenced by attitude toward the behaviour, perceived social expectations and perceived control. A patient may intend to stop smoking but feel unable to do so because friends smoke, stress is high and treatment is unavailable. Strengthen intention and practical control together. 7. Stages of Change Precontemplation: the person is not considering change. Contemplation: the person is ambivalent. Preparation: the person plans a change. Action: the person is actively changing. Maintenance: the new behaviour is sustained. Relapse: the old behaviour returns; this is a learning opportunity, not proof of failure. Advice should match readiness. Motivational interviewing is more useful than arguing with a person who is not ready. 8. Social Cognitive Theory Behaviour is shaped by reciprocal interaction between the person, behaviour and environment. Key ideas include observational learning, self-efficacy, outcome expectations, goals, self-regulation and reinforcement. A doctor can help the patient set a small goal, monitor progress, anticipate barriers and reward improvement. 9. Behaviour modification in clinical practice Ask permission to discuss the behaviour. Assess what the patient does, when, where, with whom and why. Identify benefits and costs from the patient’s perspective. Explore readiness and confidence on a 0–10 scale. Agree on one or two specific changes. Use SMART goals: specific, measurable, achievable, relevant and time-limited. Provide skills, alternatives, reminders and follow-up. Review progress without shame and adapt the plan. 10. Motivational interviewing principles Use open questions, affirmations, reflective listening and summaries. Express empathy, develop discrepancy between goals and current behaviour, avoid direct confrontation, support autonomy and elicit the patient’s own reasons for change. Example Instead of saying “You are careless because you do not take your medicines,” ask: “What makes it difficult to take them every day?” This may reveal cost, shift work, side effects, forgetfulness or misunderstanding. 11. Common behaviours and clinical applications Medication adherence Check access, dosing complexity, beliefs, side effects, memory, literacy and family support before changing treatment. Nutrition Assess food security, culture, income, cooking facilities and the patient’s goals; avoid unrealistic diets. Substance use Screen non-judgementally, assess dependence and safety, offer brief intervention and referral where needed. Prevention Explain absolute benefits, address fear and access barriers, and use reminders for vaccination and screening. 12. Barriers and relapse Relapse may follow stress, illness, social pressure, treatment side effects, financial crisis or loss of support. A prevention plan identifies high-risk situations, coping alternatives, emergency contacts and a rapid return to care. Avoid language that increases shame, because shame can drive concealment and further risk. 13. Doctor’s role Model respectful and healthy professional behaviour. Screen for risk behaviours routinely and privately. Link behaviour to the patient’s own health goals. Address social determinants that make change difficult. Use

Sociology and Anthropology

Social Determinants of Health: Meaning, Categories and Their Effect on Health

doctorsrevision@gmail.com / September 22, 2026

Social Determinants of Health Health is not produced only inside a hospital. A person’s health is shaped by biology, behaviour, family, culture, income, education, housing, work, environment, politics and the health system. These notes provide a detailed, clinically useful explanation of the social determinants of health (SDOH) for medical students, doctors and other health professionals. Learning objectives After studying this topic, the learner should be able to define health and its determinants; explain the social gradient, health inequalities and health inequities; describe the Dahlgren–Whitehead model; classify structural and intermediary determinants; connect each determinant to disease pathways; take a socially informed history; and plan individual, community and policy-level responses. 1. The concept of health The World Health Organization defines health as a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity. In practice, health is multidimensional. It includes physical functioning, emotional and mental well-being, social relationships, ability to work or learn, ability to adapt to change, and the capacity to participate in family and community life. Health can therefore be understood at three related levels: Individual health: the condition and functioning of one person. Population health: the health outcomes of a defined population and how those outcomes are distributed. Health equity: the removal of unfair and avoidable differences between groups. 2. What are social determinants of health? Social determinants of health are the conditions in which people are born, grow, learn, work, live and age, together with the wider economic, social, cultural, environmental and political forces that shape those conditions. They include access to power, money, education, food, housing, transport, information and health services. They are called “social” because they are largely created or modified by families, communities, institutions, markets, governments and social relationships. They are called “determinants” because they influence exposure to risks, vulnerability, health behaviours, ability to obtain care and the consequences of illness. Do not oversimplify SDOH do not mean that social factors replace biology. Disease results from interaction between biological susceptibility, exposure, behaviour, environment and access to effective care. A socially informed doctor asks what happened medically and what circumstances made that illness more likely, more severe or more difficult to treat. 3. Why the determinants of health are important They explain why people with the same diagnosis may have different outcomes. They help clinicians identify causes and risks before complications occur. They guide prevention, health promotion and community diagnosis. They reveal why some patients repeatedly return with the same problem. They help health systems target resources where avoidable risk is greatest. They shift practice from blaming individuals to addressing modifiable causes. Social conditions can influence exposure, susceptibility, disease recognition, health-seeking behaviour, treatment adherence, recovery, disability and survival. They may operate before birth, accumulate across life and pass through generations. 4. Dahlgren–Whitehead model: the “rainbow” of determinants The Dahlgren–Whitehead model presents determinants as layers around the individual: Layer Main elements Clinical meaning Individual factors Age, sex, genetic inheritance and constitutional factors Influence vulnerability, development, reproductive health and disease risk. Individual lifestyle Diet, activity, tobacco, alcohol, sleep, coping and sexual behaviour Behaviours affect risk, but choices are constrained by social circumstances. Social and community networks Family, friends, peers, faith groups, community organisations and participation Provide emotional, practical and informational support or may create pressure and stigma. Living and working conditions Housing, education, employment, workplace, water, sanitation, food, transport and health services Shape daily exposure, access and the ability to protect health. General socioeconomic, cultural and environmental conditions Government, policy, economy, culture, social norms, environment and distribution of resources Set the rules and opportunities that produce social position and health inequity. 5. Structural determinants Structural determinants create the social hierarchy in which people live. They include governance, laws, public policy, economic systems, social protection, taxation, education policy, labour markets, gender relations, racism, disability discrimination, conflict and commercial influence. 5.1 Socioeconomic position Income, wealth, education and occupation influence food, housing, transport, safety, social networks, health literacy and the ability to pay for care. Poverty may cause illness directly through deprivation and indirectly through stress, unsafe work and delayed treatment. Wealth can protect health by providing choices and buffers during illness. 5.2 Political and policy environment Government decisions affect health through health financing, public education, water systems, roads, housing regulation, food safety, tobacco and alcohol control, employment protection, social protection, refugee policy and emergency preparedness. A policy can create health or harm even when it is not labelled a health policy. 5.3 Gender, discrimination and social exclusion Gender norms influence autonomy, exposure to violence, nutrition, workload, reproductive decisions and access to money. Discrimination based on ethnicity, disability, HIV status, mental illness, age, religion, sexuality or poverty may reduce trust and delay care. Doctors should recognise discrimination as a health risk, not as a patient defect. 6. Living and working conditions 6.1 Housing and physical environment Overcrowding, poor ventilation and indoor air pollution increase respiratory infections and chronic lung disease. Unsafe structures increase injuries. Dampness and mould can worsen asthma. Insecurity and homelessness increase stress and make storage of medicines and regular follow-up difficult. 6.2 Water, sanitation and hygiene Unsafe water, inadequate sanitation and poor hand hygiene contribute to diarrhoeal diseases, helminthic infections, cholera, typhoid and other outbreaks. Doctors should ask about water source, storage, latrine access, handwashing facilities and household crowding when evaluating recurrent gastrointestinal or infectious illness. 6.3 Food and agriculture Food insecurity can cause undernutrition, anaemia, poor immunity, poor fetal growth and impaired learning. Cheap energy-dense foods can contribute to obesity, hypertension and diabetes. Agricultural work may involve pesticides, injuries, zoonoses, heat exposure and musculoskeletal strain. Food safety includes production, storage, preparation and distribution. 6.4 Employment and unemployment Work can provide income, purpose and social connection, but may also expose people to dust, chemicals, noise, radiation, infection, heat, repetitive strain and injury. Unemployment may cause poverty, anxiety, depression, loss of routine and inability to pay for care. Ask about occupation, hazards, protective equipment, working hours and income insecurity. 6.5 Education and health literacy Education improves employment opportunity, problem-solving, communication and

Author name: doctorsrevision@gmail.com