Pain scale

The 0–10 numeric rating scale is the most used measurement in musculoskeletal care and the most casually collected. Three readings — now, best, worst — turn a mood into data.

Ink-and-wash drawing of a blank ruled card and a pencil on a plinth
A blank ruled card and a pencil, waiting on the plinth.

Ask the same question the same way

The number is only comparable if the question is identical every time. “How is the pain today?” and “Rate your pain right now, zero to ten, where ten is the worst you can imagine” produce different scales in the same patient. Write the question down and use it verbatim.

Two points is the threshold

A one-point move is inside the noise of the instrument. Around two points — or roughly a third of the starting score — is where patients start describing the change as worth having. Set goals accordingly.

The spread is the interesting number

A week that runs 2 to 7 is a different clinical problem from one that sits flat at 5, even though the averages match. A wide spread points at load, sleep or position — things you can change. A flat middling score more often points at central sensitisation or at a plan that is not doing anything.

Pain is not the only outcome

Pair the rating with something functional. For an upper limb that is usually the DASH; for exertion tolerance it is the Borg RPE scale. Pain that improves while function does not is a finding, not a success.

Red flag — refer out

Pain that climbs steadily against treatment, wakes the patient every night, or arrives with unexplained weight loss or fever is not a scale problem. Refer.

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