Pain Assessment: Nursing Scales, PQRST & Escalation Guide | NurseOnShift

🩹 Assessment & symptom control

Pain Assessment: Scales, Character Documentation & Reassessment

A number on the chart is not the whole story—location, quality, and what changed since the last dose decide whether you escalate or wait. This guide covers how nurses perform pain assessment with age-appropriate tools, link scores to chest pain and abdominal pain patterns, time reassessment after morphine or acetaminophen, and pair comfort with safe patient positioning.

9 min read

Updated 24 May 2026

Medically Reviewed

Written by

Sid A. Abdala Balal

RN — Registered Nurse

Medically Reviewed by

Dr. Adam Sayedi

MD — Medical Doctor

Quick summary What is pain assessment? Choosing a pain scale Character & red flags When patients cannot self-report Reassessment after treatment Indications Limits & cautions Equipment Assessment steps Escalation Documentation Clinical pearls Patient teaching NCLEX practice FAQ References Related topics Editorial review

Quick facts

Adult default

0–10 numeric rating

Reassess

After each analgesic dose

Typical pass

3–8 min focused

Escalate first

Sudden severe / new pattern

Key takeaway

Treat pain as the fifth vital sign only when you also document character, triggers, and response to the last intervention. A falling number without improved function or comfort means the plan is not working yet—reassess and notify using your escalation pathway.

Quick procedure summary

Item	Detail
Procedure name	Pain assessment (pain evaluation)
Also known as	Pain scale; pain scoring; pain evaluation
Category	Patient assessment — symptom monitoring
Clinical purpose	Quantify and describe pain, guide analgesia and comfort measures, detect deterioration, and evaluate treatment response
Who performs	Registered nurses, nursing associates, paramedics; students under supervision
Typical time	About 3–8 minutes for a focused assessment; longer when behavioural tools or interpreter support is needed
Settings	All inpatient, outpatient, community, emergency, perioperative, and critical care areas

What is pain assessment?

Pain assessment is a structured nursing evaluation of a patient's pain experience: intensity (usually on a validated scale), location, quality, timing, aggravating and relieving factors, and impact on breathing, movement, sleep, and mood. It informs whether prescribed analgesia is given, whether non-drug measures are appropriate, and when medical review is needed for a new or dangerous pattern.

Assessment is repeated—not a one-time admission box—because pain changes with procedures, inflammation, anxiety, and medication effect. Integrate findings with vital signs measurement, relevant portions of head-to-toe assessment, and specialty exams (for example neurological assessment when headache or spine injury is suspected).

Principles align with Royal Marsden Manual — Pain assessment (Procedure 10.1) and publicly available guidance; proprietary step text is not reproduced here.

Choosing the right pain scale

Match the tool to communication ability, age, and care setting. Institutional protocols may vary—use the scale your organisation has validated and trained staff to apply consistently.

Patient context	Common tools	Nursing notes
Alert adult, cognitively intact	Numeric rating scale (0–10); visual analogue scale	Ask pain now and worst in 24 h; confirm what zero and ten mean for them
Child or non-verbal adult	FLACC, Wong–Baker FACES, behavioural scales	Observe face, legs, activity, cry, consolability—do not rely on a spoken number
Mechanically ventilated / ICU	CPOT, BPS, or local ICU behavioural tool	Pair with sedation score; distinguish pain from ventilator dyssynchrony
Advanced dementia / severe cognitive impairment	PAINAD, Abbey Pain Scale, or equivalent	Compare with baseline behaviour; rule out urinary retention, fracture, infection

Document the tool name in the record (for example "NRS 7/10") so handover teams interpret the score correctly.

Character documentation and red-flag patterns

Use a brief mnemonic—commonly OPQRST (onset, provocation/palliation, quality, region/radiation, severity, time)—to capture what a number alone cannot explain.

Presentation cluster	Questions to ask	Consider
Chest pain	Pressure vs sharp; radiation to jaw/arm; exertional; associated sweat, nausea, breathlessness	Acute coronary syndrome pathway; do not delay escalation for severe or persistent symptoms
Abdominal pain	Localisation; rigidity; fever; vomiting; last bowel motion; pregnancy status when relevant	Surgical abdomen, perforation, ischaemia—urgent medical review
Headache	Thunderclap onset; neck stiffness; focal neuro deficit; post head injury	Subarachnoid haemorrhage, meningitis, raised intracranial pressure—emergency assessment
Back pain with neuro change	Bladder/bowel dysfunction; saddle anaesthesia; leg weakness	Cauda equina suspicion—stop routine comfort measures and escalate
Chronic widespread pain	Long duration, fatigue, sleep disruption, functional limits	Fibromyalgia or inflammatory causes; avoid dismissing as "only chronic"

When the patient cannot self-report

Assume pain is present until proven otherwise when injury, surgery, inflammation, or agitation suggests discomfort. A patient who scores "0" while grimacing and guarding is not pain-free—you need a behavioural tool and collateral history from family or carers.

Screen for reversible causes: full bladder, constipation, incorrect positioning, poorly fitting cast, infection with fever
Differentiate pain from delirium: fluctuating attention with agitation may need both comfort and cause review
In oncology contexts, cancer-related pain may need specialist titration—see lung cancer and palliative pathways when relevant
Non-drug measures (distraction, relaxation, heat application when appropriate) complement—not replace—ordered analgesia

Reassessment after analgesia and comfort measures

Every administered dose deserves a follow-up pain score and functional check (can they deep breathe, cough, turn, or sleep?). Reassessment timing follows local policy and route of medication—IV opioids often need earlier checks than oral paracetamol.

Evaluate outcomes (not only the number)

Improving: score drops with easier movement and stable vitals
Partial: score falls but guarding or nausea (nausea) limits care—notify prescriber
Worse or unchanged: reassess character for red flags; consider alternate route or adjunct; escalate if severe

When administering PRN opioids, confirm allergy status, respiratory rate, sedation level, and bowel plan per your opioid safety bundle—nurses do not independently change prescriptions but must report inadequate relief promptly.

Indications

Admission, pre- and post-procedure, and each nursing handover
Patient-reported pain or non-verbal distress cues
Before and after wound care, mobilisation, or dressing changes
When vital signs change (tachycardia, hypertension) or confusion appears
Chronic conditions such as arthritis with flare symptoms (joint pain, muscle pain)
After any analgesic or regional block per protocol

Limits and cautions

Interpret scores in context

Cultural and personal stoicism affect reporting—ask about function, not only a number
Sedation can mask pain expression; use behavioural tools
Substance use history requires non-judgmental assessment; follow local substance misuse policies

Do not rely on pain score alone when

Sudden severe pain with haemodynamic instability
New neuro deficit, rigid abdomen, or crushing chest pain
Suspected compartment syndrome, testicular torsion, or acute limb ischaemia

Equipment

✓Validated pain scale card or chart-integrated tool

✓Interpreter or communication aid when needed

✓Observation chart and access to medication administration record

✓Penlight and basic assessment tools if neuro symptoms present

Step-by-step pain assessment

Prepare and verify

Confirm identity, privacy, and whether the patient needs analgesia before you can examine comfortably.

Select and explain the scale

Choose numeric, faces, or behavioural tool; define 0 and 10 (or equivalent) in plain language.

Record intensity and character

Score pain now; document site, quality, radiation, onset, and what worsens or relieves it (OPQRST).

Observe behaviour and vital signs

Note guarding, diaphoresis, respiratory rate, and interaction with movement; complete focused exam if red flags present.

Compare with previous scores and goals

Read last entry and patient-specific target (for example acceptable score for sleep or physiotherapy).

Act within scope

Administer ordered PRN analgesia via appropriate route (for example ibuprofen or morphine per MAR); apply non-drug measures when indicated.

Reassess and document response

Repeat score after the expected onset interval; record relief, side effects, and time of next check.

When to escalate

Finding	Nursing action
Pain unrelieved after appropriate doses per protocol	Notify prescriber; document interventions and times; consider acute cause
Respiratory depression or excessive sedation after opioid	Follow opioid emergency pathway; stimulate, oxygen, naloxone only per order and scope
New severe pain with abnormal vitals or exam	Urgent medical review; consider sepsis screening if infection suspected
Patient unable to describe pain but deteriorating	Switch to behavioural tool; escalate for diagnostic review

Documentation

Example wording

"16:05 — NRS 8/10 sharp left lower abdominal pain, worse on movement, started 2 h ago; PRN morphine 5 mg SC given per MAR; repositioned for comfort. Reassess 16:35. RN Okonkwo."

Include tool used, score, site, character, interventions, reassessment plan, and patient goal. Follow unit documentation standards for late entries and corrections.

Clinical pearls

Ask "What is an acceptable pain level for you today?" to align expectations with realistic targets.
Pre-empt pain before painful procedures when orders allow—assessing only afterward undervalues prevention.
Pair PRN use with bowel and nausea plans when starting opioids.
If the patient declines analgesia, document informed refusal and continue to offer reassessment.

Patient teaching

Explain that reporting pain early improves recovery and does not mean "being difficult." Teach how to use the scale, when PRN medication is appropriate, and non-drug strategies that help (positioning, relaxation, guided breathing). Provide written plans for take-home analgesia only per discharge instructions.

Bedside Decision-Making Questions

Practice NCLEX-style clinical judgment practice for pain assessment—numeric and behavioural scales, OPQRST-style character, priority action before analgesia, select-all-that-apply cues, post-opioid trend interpretation, matrix escalation, and documentation cloze (recognise cues → analyse → prioritise → act → evaluate outcomes).

Unfolding case — surgical ward. Mr. Hassan, 54, is post-op day 1 after laparoscopic bowel resection. He rates pain 8/10 sharp in the left lower abdomen, worse when turning. RR 18, HR 102, BP 128/76 mmHg. Orders: morphine 5 mg subcutaneous PRN for moderate–severe pain; reassess 30 min after dose. He has not received morphine this shift.

Question 1 — Priority action

Which action should the nurse take first?

Document pain 8/10 and defer medication until the evening round to avoid oversedation. Complete hygiene care first because the patient can tolerate pain briefly. Perform a focused pain assessment (site, character, vitals), administer PRN morphine per MAR, and schedule reassessment in 30 minutes. Tell the patient to use deep breathing only and avoid opioids on day 1.

Question 2 — Select all that apply

Select all that apply — which findings support treating this pain as a priority now?

Numeric rating 8/10 with movement limitation Guarding and facial grimace when asked to turn Patient prefers sports television in the afternoon Tachycardia 102/min with acute post-operative pain Sharp localised pain worsening with planned repositioning

Question 3 — Trend interpretation

Thirty minutes after subcutaneous morphine 5 mg:

Trend snapshot
Pain: NRS 8/10 → 4/10
RR: 18 → 16/min; SpO₂ 96% room air
Sedation: alert, conversant
Function: turns with standby assist only (needed two staff before dose)
Abdomen: soft, no new rigidity reported

Select all that apply — which nursing actions are appropriate?

Document analgesic given, score change, and improved turning tolerance Cancel all further pain checks because one dose worked Continue scheduled reassessment and monitor RR and sedation Ignore RR 6/min if the patient says pain is zero Set next pain reassessment per protocol and notify if score rises again

Question 4 — Matrix judgment

For each pain-related situation, select the best nursing action category (one per row).

Situation	Continue routine monitoring / supportive care	Notify clinician / urgent same-day pathway	Activate rapid response / emergency escalation
NRS 3/10 after PRN dose, calm, RR 14, turning with standby assist only
NRS still 9/10 forty minutes after second PRN morphine per protocol
Sudden crushing chest pain 10/10 with diaphoresis and RR 28
Dementia patient: new moaning and rigid legs, PAINAD rising, no fever yet

On a small screen, swipe or scroll sideways to see the full table.

Question 5 — Documentation cloze

Complete the pain entry: ; intervention: ; follow-up: .

Answer key & rationale

Next step Timed NCLEX Next Gen–style scenarios on NurseOnShift

Frequently asked questions

FAQ

How often should pain be reassessed?

At minimum with each vital sign round, before and after procedures, and after every analgesic dose—follow your organisation's frequency for high scores or IV opioids.

What if the patient says their pain is 10/10 but they are talking on the phone?

Do not dismiss the score—ask about fluctuation, what makes it spike, and functional limits. Behaviour and self-report can diverge; document both and investigate causes.

Can I give morphine if the respiratory rate is slightly low?

Follow local opioid guidelines and prescriber orders. When in doubt, hold the dose, reassess sedation and respirations, and contact the prescriber—patient safety overrides convenience.

Is acetaminophen enough for severe post-operative pain?

Multimodal analgesia is common; paracetamol alone may be inadequate for major surgery. Assess, document, and escalate unrelieved pain—do not tell the patient to tolerate severe pain without review.

Which scale should I use for a patient with dementia?

Use a validated behavioural pain scale for non-verbal or cognitively impaired adults, compare with baseline, and involve carers who know usual behaviour.

What should nursing documentation include?

Tool and score, location and character, interventions given, patient response, reassessment time, and escalation if relief is inadequate.

References

Royal Marsden Manual — Pain assessment (Procedure 10.1, Chapter 10).
https://www.rmmonline.co.uk/manual/c10-fea-0003
Royal Marsden Manual — Non-pharmacological methods of managing pain (Chapter 10).
https://www.rmmonline.co.uk/manual/c10-sec-0197
Royal Marsden Manual — Procedures hub (general nursing procedure library).
https://www.rmmonline.co.uk/contents/procedures
NICE. Chronic pain (primary and secondary) in over 16s: assessment of all chronic pain and management of chronic primary pain (NG193).
https://www.nice.org.uk/guidance/ng193
NICE. Neuropathic pain in adults: pharmacological management in non-specialist settings (CG173).
https://www.nice.org.uk/guidance/cg173
NHS. Pain — overview and self-management context.
https://www.nhs.uk/conditions/pain/
WHO. Cancer pain relief and palliative care — public health context for analgesic ladder principles.
https://www.who.int/news-room/questions-and-answers/item/cancer-pain-relief-and-palliative-care
CDC. Opioids — Information for Patients (safe use and risk communication).
https://www.cdc.gov/opioids/patients/index.html
Doyle GR, McCutcheon JA. Clinical Procedures for Safer Patient Care — pain assessment context (BCcampus).
https://opentextbc.ca/clinicalskills/

Editorial standards & medical review

About the author: Sid A. Abdala Balal, RN, writes evidence-based nursing education focused on practical bedside skills, patient safety, and clinical decision support for nurses.

Medical review: This guide is reviewed by Dr. Adam Sayedi, MD, for clinical accuracy, clarity, and alignment with current nursing standards for pain assessment and analgesia monitoring.

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