Pain-assessment tools • Self-report • Multidimensional instruments • Children • Non-verbal patients

Using Pain-Assessment Tools in Adults, Children and Palliative Care

How to choose, administer, interpret and document pain scales safely

Learning objectives

• Explain why pain should be measured and distinguish unidimensional from multidimensional tools.
• Administer numeric, verbal, visual, faces and observational scales correctly.
• Select tools for adults, children, neonates, older adults with cognitive impairment and critically ill patients.
• Use multidimensional tools to assess location, quality, interference, neuropathic features and function.
• Avoid common errors in translation, scoring, documentation and interpretation.
• Build a repeatable assessment–intervention–reassessment loop.

1. Why use a pain tool?

The supplied reference describes pain assessment as essential for diagnosis, monitoring progress and modifying treatment. A validated tool gives the team a shared language and makes change visible over time. It can:

• establish a baseline at triage, admission, procedure, discharge or home review;
• identify pain at rest and with movement or activity;
• compare response after an intervention;
• detect recurrence, breakthrough or end-of-dose patterns;
• support communication at handover and between patient, caregiver and multidisciplinary team;
• reveal interference with sleep, feeding, breathing, mobility, work and relationships.

Measurement is meaningful only when the same tool, anchors, context and timing are used consistently. Ask the patient what a tolerable or acceptable level means for them; a universal “zero pain” target is not realistic or necessary for every condition.

2. The measurement hierarchy

1. Self-report: use whenever the patient can understand the tool and communicate a response. This is the reference standard for subjective pain.
2. Supported self-report: adapt language, use an interpreter, pictures, a body map, a communication board or assistive device.
3. Caregiver report: valuable for baseline behaviour, change and function, but not a substitute for the patient when self-report is possible.
4. Behavioural observation: use a validated observational tool for infants, advanced dementia, delirium, sedation, intubation or inability to communicate.
5. Physiological signs: heart rate, blood pressure, breathing, sweating and pupil change may support an assessment but are not a pain scale.

3. Unidimensional self-report scales

3.1 Numeric Rating Scale (NRS)

The usual NRS asks, “On a scale from 0 to 10, where 0 is no pain and 10 is the worst pain you can imagine, what number is your pain now?” Some services use 0–10 or 0–100. State the anchors and use the same scale on review.

Strengths	Limitations and safeguards
Fast, familiar, easy to repeat; useful for triage, adults and many older children.	Requires understanding of numbers and abstract ranking; may be difficult with delirium, language barriers, severe distress or developmental disability.
Can record rest, movement, best, worst and acceptable pain.	“8/10” has different meanings between people; do not compare patients as if scores were objective units.

Document precisely: “NRS 7/10 at rest and 9/10 on movement, left hip, before intervention.”

3.2 Verbal Descriptor Scale (VDS)

The patient selects a word such as none, mild, moderate, severe or unbearable. Use the exact words on the validated local version; do not assume that “moderate” means the same thing for all languages or cultures.

• Useful for low literacy, older adults and people who dislike numbers.
• Ask whether the selected word describes intensity now, the worst pain or pain interference.
• Provide translated terms through a trained interpreter and check meaning with teach-back.

3.3 Visual Analogue Scale (VAS)

A VAS is a line anchored by “no pain” and “worst pain.” The patient marks the point that represents pain; the distance is measured. It can be paper or digital.

• Requires vision, hand control, comprehension and ability to translate an experience into a position.
• It is less suitable during severe acute distress, in very young children or when vision/motor function is impaired.
• Do not replace the patient’s mark with an observer’s estimate.

3.4 Verbal Numeric and categorical anchors

Some settings combine numbers with categories such as mild, moderate and severe. Explain that categories are approximate and follow the local validated protocol rather than treating a cutoff as a diagnosis. Always add location, mechanism, functional effect and clinical context.

4. Faces and pictorial scales for children

Wong–Baker FACES

Show the child a sequence of faces linked to increasing pain intensity and explain: “These faces show how much something can hurt. Point to the face that shows how much you hurt inside—not the face that looks like you.” Use the child’s selected face as a self-report, not an assessment of facial expression.

• Often helpful for children approximately three years and older when developmentally appropriate.
• Use the validated version and language; do not improvise faces or attach adult assumptions.
• Ask whether the pain is at rest or during movement and repeat the same way.

Other pictorial supports

Body maps, colour gradients, drawings, dolls or a communication board may help children identify site and quality. They supplement, not replace, a validated intensity tool. Ask the child to point, draw or demonstrate what makes it better or worse.

5. Multidimensional tools

Unidimensional scales measure intensity at one moment. Multidimensional instruments describe location, quality, timing, interference, emotional effects and sometimes neuropathic features. They take longer but are valuable for persistent, cancer-related, complex or mixed-mechanism pain.

Instrument	What it measures	Clinical use and cautions
Brief Pain Inventory (BPI)	Pain severity, worst/least/average/current pain, location and interference with general activity, mood, walking, work, relationships, sleep and enjoyment of life.	Useful in cancer and persistent pain; use the validated language version and clarify the recall period.
McGill Pain Questionnaire / Short-Form MPQ	Descriptive sensory and affective words, intensity and present pain.	Rich description of quality and emotional experience; literacy, time and language translation matter.
Neuropathic Pain Questionnaire (NPQ)	Qualities suggestive of neuropathic pain, including burning, cold, electric and tingling features.	Supports—but does not establish—a neuropathic diagnosis; examine for lesion or disease of the somatosensory system.
DN4	Neuropathic descriptors and sensory examination findings such as touch hypoesthesia, pinprick hypoesthesia and brush allodynia.	Use only when trained; score thresholds and validation depend on the version and setting.
LANSS / S-LANSS	Neuropathic symptoms and sensory responses.	Can support phenotyping; false positives and mixed pain are possible.
Edmonton Symptom Assessment System (ESAS)	Multiple palliative symptoms—often pain, tiredness, drowsiness, nausea, appetite, breathlessness, depression, anxiety and wellbeing.	Useful for symptom burden and trends; it is not a substitute for a focused pain assessment or emergency examination.
Functional measures	Ability to walk, breathe, cough, sleep, eat, work, dress, turn or perform meaningful activities.	Pair with intensity; functional goals may be more clinically relevant than a zero score.

6. Observational tools for patients who cannot self-report

FLACC: Face, Legs, Activity, Cry, Consolability

Each domain is scored 0–2 for a total of 0–10. Observe the child at rest and during an appropriate care activity, then repeat after comfort measures. Use the validated version and document the behaviours that produced the score.

Domain	Observe
Face	No particular expression, occasional grimace/frown, or frequent quivering chin/clenched jaw.
Legs	Relaxed, restless/tense, or kicking/drawn up.
Activity	Lying quietly, squirming/guarding, or arched/rigid/jerking.
Cry	No cry, occasional moan/whimper, or crying/screaming.
Consolability	Content, reassured by occasional touch, or difficult to console.

Behaviour may reflect fear, hunger, withdrawal, delirium or dyspnoea as well as pain. Investigate alternative causes.

PAINAD for advanced dementia

Observe breathing, negative vocalization, facial expression, body language and consolability. Establish the person’s baseline and ask familiar caregivers what changes are meaningful. Do not assume that a low score means no pain if the tool is unfamiliar, the person is sedated or the cause has not been examined.

CPOT and critical-care tools

For an intubated or critically ill adult, tools such as the Critical-Care Pain Observation Tool use facial expression, body movements, muscle tension and ventilator compliance or vocalization. Follow local training and do not interpret ventilator dyssynchrony in isolation; hypoxia, anxiety and equipment problems can contribute.

Neonatal tools

NIPS and CRIES assess crying, facial expression, breathing, limb position, arousal, oxygen requirement, vital-sign change and sleep. Use a neonatal tool consistently, minimize repeated painful procedures and combine the score with gestational age, illness severity and caregiver observations.

7. Choosing the right tool: a practical decision pathway

1. Can the patient understand and communicate? If yes, use self-report first.
2. Which language and sensory method work? Arrange interpreter, large print, hearing support, pictures or communication device.
3. What is the clinical question? Intensity now, trend, neuropathic features, symptom burden, interference or procedural pain?
4. Which validated tool is available for age and setting? Record the name and version.
5. What are the context and anchors? Rest versus movement, before versus after treatment, current versus worst, and recall period.
6. Does the result fit the examination? An unexpected score prompts a fuller assessment; it is not a reason to accuse the patient or ignore red flags.
7. How will it be repeated? Set a time based on the intervention, acuity and local protocol.

8. How to administer a scale correctly

9. Scoring, interpretation and trends

• No universal cutoffs: mild/moderate/severe categories vary by tool, disease and institution. Use local validated guidance.
• Minimal important change: a change that matters to one person may not matter to another; link the score to function and the patient’s goal.
• Trend beats a single number: graph or compare pre-intervention, post-intervention, movement and overnight scores.
• Discordance is information: a low score with severe guarding, or a high score with a calm appearance, deserves further questions—not dismissal.
• Response is not proof: improvement after an analgesic supports a pain component but does not prove the cause; placebo, reassurance, positioning and natural fluctuation also affect scores.

10. Cultural, language and accessibility considerations

• Use a trained interpreter for high-stakes communication; do not rely on a child to interpret serious information.
• Check whether “pain,” “pressure,” “heat,” “suffering” or local expressions carry different meanings.
• Do not mistake stoicism, crying, eye contact or a particular facial expression for a universal severity signal.
• Explain that the patient is rating their own experience, not trying to please the clinician.
• For people with visual, hearing, motor, cognitive or speech impairment, ask what adaptation works best.
• Protect confidentiality when discussing pain related to sexual health, HIV, substance use, trauma or family violence.

11. Tools in emergency and palliative contexts

Context	Useful tool approach	Extra safety questions
Emergency triage	Rapid NRS/VDS or behavioural observation plus ABCDE and focused history.	Onset, red flags, vital signs, neurovascular status, pregnancy, trauma and sepsis.
Procedure or wound care	Record baseline, movement/procedural score and recovery score with the same scale.	Consent, analgesia plan, sedation, monitoring and unexpected deterioration.
Cancer or palliative review	NRS/VDS plus body map, BPI or ESAS, mechanism screen and function.	New pattern, spinal cord compression, fracture, obstruction, infection, medication toxicity and caregiver capacity.
Critical care	Self-report when possible; CPOT or local validated behavioural tool if not.	Delirium, ventilator issues, hypoxia, sedation, withdrawal and pressure injury.
Home or community care	Simple repeated NRS/VDS/faces tool, symptom diary and functional goal.	Medicine access, safe storage, caregiver understanding, transport and escalation route.

12. Documentation example

13. Common errors and corrections

Error	Correction
“Rate your pain” without explaining anchors.	Explain 0 and the highest value, then specify time and context.
Using a faces scale to judge the child’s facial appearance.	Ask the child to choose the face representing their internal pain.
Repeating different tools on every shift.	Use the same validated tool where possible and document any change.
Using an observational score when a patient can self-report.	Ask the patient first; use observation only as support.
Assuming a score is a diagnosis or dose calculator.	Combine it with history, examination, cause, mechanism and safety review.
Ignoring function and caregiver burden.	Record what the patient can and cannot do and the goal that matters.
Failing to reassess.	Set a review time and record benefit, adverse effects and new red flags.

14. Clinical cases

15. Quick self-test

1. What is the primary source of pain information when a patient can self-report?
2. When would you choose a multidimensional instrument instead of only an NRS?
3. What does FLACC assess?
4. Why are physiological signs not sufficient as a pain tool?
5. What five contextual details should accompany a score?
6. What should you do if the score and observed behaviour disagree?

Answers

1. The patient’s own report, supported by history, examination and context.
2. For persistent, cancer-related, complex or mixed pain when quality, interference, location and neuropathic features matter.
3. Face, Legs, Activity, Cry and Consolability, each scored 0–2.
4. They are non-specific, affected by shock, medicines, age, chronic illness and autonomic disease, and can be normal despite severe pain.
5. Tool/anchors, time, site, rest versus movement, and effect on function; also record quality and associated symptoms when relevant.
6. Reassess the patient, tool comprehension, context, causes and safety; do not dismiss or automatically accept the score without clinical reasoning.

Key take-home points

• Use self-report whenever possible and match the tool to the patient’s age, development, language and communication ability.
• Unidimensional scales measure intensity; multidimensional tools describe the wider pain experience.
• Observational tools identify behaviours, not an objective pain truth; investigate alternative causes.
• Record the tool, score, context, function, intervention, response and adverse effects.
• Trends and patient goals are more useful than isolated scores.
• Tools never replace ABCDE, examination, cause-finding or emergency escalation.

Further study and references

• Assessment of Pain — supplied Slideshare reference
• Clinical Assessment of Pain in Adults and Children — Makerere University
• IASP terminology and pain definitions
• WHO: Palliative care
• NICE: Chronic pain assessment and management
• Related lesson: Clinical assessment of pain in adults and children

Educational resource for supervised learning. Apply current Uganda protocols, validated local translations and senior clinical advice.