What is the difference between DOMS and an injury?
Last updated September 3, 2026.
Timing and character tell them apart: DOMS arrives 12-plus hours after training as a dull, widespread ache that fades in 3 to 5 days; injury pain is sharp, focal, and lingers. Cleveland Clinic's lines: soreness lasting a week or more points to injury, and injury pain feels sharp and constant rather than dull and generalized. Injuries also tend to start during the activity - a pull, a pop - with swelling or one-sided weakness. DOMS improves with gentle movement; injuries complain about specific motions. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What to do
- Check the clock: peaked at 1 to 3 days and fading = DOMS; started mid-workout or past a week = injury.
- Check the map: both legs, general muscles = DOMS; one specific spot with swelling = injury.
- Treat DOMS gently: light movement, easy sessions - it resolves on its own.
- Get seen if: sharp or constant pain, swelling, bruising, weakness, or pain past a week - that is a strain or sprain question.
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