Chronic pain scales and how to use them.

What pain scales are used?

Numeric Rating Scale (NRS)

The familiar 0–10, where 0 is no pain and 10 is the worst pain imaginable. Quick, validated, and used everywhere. Its weakness in chronic pain is that it measures one dimension at one moment.

Visual Analogue Scale (VAS)

A 100mm line marked from 'no pain' to 'worst possible pain', where you mark a point. Slightly more sensitive than the NRS, and more awkward to administer.

Functional pain scale

Rates pain by its effect on activity rather than by intensity — for example: 0, no pain; 2, pain present but I can do everything; 5, pain limits some activities; 8, pain prevents most activities; 10, pain prevents everything. Far more actionable in chronic pain.

Brief Pain Inventory (BPI)

The workhorse of chronic pain research. Records worst, least, average, and current pain, plus interference across seven domains: general activity, mood, walking, work, relationships, sleep, and enjoyment of life. The interference scores often matter more than the intensity ones.

McGill Pain Questionnaire

Uses descriptor words — throbbing, shooting, burning, gnawing, aching — grouped into sensory, affective, and evaluative categories. Particularly useful for distinguishing neuropathic from nociceptive pain, since the words people choose track the mechanism.

PEG scale

A three-item version designed for primary care: Pain intensity, Enjoyment of life, and General activity, each 0–10. Fast enough for a routine appointment and captures the dimensions that matter.

Beyond intensity: disability and belief measures

The scales above all measure how much something hurts. Two other instruments are standard in chronic pain care because they measure what the hurting is costing you, and what you believe it means — both of which predict outcomes better than intensity does.

• [Oswestry Disability Index](/oswestry-disability-index) — ten sections scoring how much back pain limits lifting, walking, sitting, sleeping, and social life, expressed as 0–100%. The reference standard in low back pain research.
• [Pain Catastrophizing Scale](/pain-catastrophizing-scale) — thirteen items covering rumination, magnification, and helplessness, scored 0–52. Predicts disability, surgical outcome, and treatment response.
• Fear-Avoidance Beliefs Questionnaire — beliefs about whether activity and work will worsen pain. See kinesiophobia for why fear of movement predicts disability more strongly than pain severity.

Why the 0–10 scale falls short for chronic pain

The numeric scale was designed for acute pain, where intensity is the whole clinical question. Chronic pain breaks several of its assumptions.

• No shared anchor. Your 7 and someone else's 7 are not the same thing, and neither is comparable to a stranger's.
• Recalibration. After years of pain, the internal scale shifts. Something that would have been an 8 becomes 'a normal Tuesday'.
• One dimension. A 4 that stops you sleeping is worse than a 6 you can work through, and the number cannot show that.
• A moment, not a pattern. Chronic pain fluctuates. A single reading captures where you were standing, not the terrain.
• Incentive distortion. People who under-report to avoid seeming dramatic get undertreated. People who over-report to be taken seriously get treated as unreliable. Both are rational responses to a bad measurement system.

How should you describe chronic pain to a doctor?

Clinical time is short. These are the details that most change what a clinician can do.

1. Location and radiation. Where it starts, where it travels, whether it has spread since it began.
2. Quality. Burning, shooting, electric, aching, throbbing, crushing. The words carry mechanism — burning and electric suggest neuropathic pain.
3. Pattern over time. Constant or intermittent? Worse in the morning or evening? How long does morning stiffness last? Over 30–60 minutes points toward inflammation.
4. Aggravating and easing factors. What reliably makes it worse and what reliably helps.
5. Functional impact. Be concrete: how far can you walk, how long can you sit, how many hours do you sleep, what have you stopped doing?
6. What you've already tried. Treatment, dose, duration, and effect. 'It didn't work' is far less useful than 'gabapentin 300mg three times daily for eight weeks, no change'.
7. Your goal. What you want back. 'Play with my grandchildren on the floor' directs treatment better than 'less pain'.

Should you track your pain?

It depends, and the answer is not obviously yes.

When tracking helps

• Establishing a baseline before starting treatment, so you can tell whether it worked.
• Identifying patterns you would otherwise miss — the flare that follows two days after a big day, not during it.
• Providing concrete information for appointments and for insurance or disability documentation.

When tracking hurts

Detailed, frequent pain monitoring increases attention on the body, and attention on pain measurably increases pain. For someone already hypervigilant, an hourly pain diary can make things worse.

Two things worth measuring alongside intensity are the mechanism driving your pain and your fear-avoidance beliefs about movement — the second predicts disability better than the first predicts anything. The neuroplastic pain quiz scores both in about four minutes.