Understanding Delayed Onset Muscle Soreness
Delayed onset muscle soreness, usually shortened to DOMS, is the dull, widespread ache that shows up roughly a day or two after a harder or longer run than your muscles are used to. It's a normal response to unfamiliar or increased load, not a sign that something has gone wrong, though it can be uncomfortable enough to affect how you move for a few days.
Why DOMS happens
Unfamiliar effort, a longer run, more hills, or faster pace than your legs are used to, causes microscopic damage to muscle fibers. This isn't harmful in itself; it's part of how muscles adapt and get stronger over time. The soreness that follows is linked to the repair process rather than ongoing damage, which is why it typically peaks 24 to 48 hours after the effort and then fades.
What normal DOMS feels like
- A dull, widespread ache across a muscle group, like both quads or both calves
- Stiffness that's worse first thing in the morning or after sitting still
- Discomfort that eases as you warm up and move around
- Gradual improvement day by day, generally resolving within about a week
How to manage it
Light movement, walking or an easy spin on a bike, tends to help more than complete rest for most people, since gentle blood flow can ease stiffness. Staying hydrated and eating normally supports recovery too. See post-race recovery for a fuller breakdown of the first 48 hours after a harder effort.
There's no need to avoid DOMS altogether by keeping every run easy; some degree of soreness after a genuinely harder session is a normal and expected part of building fitness, not something to be worried about.
When it's not just normal soreness
DOMS is symmetrical, widespread, and improves steadily day by day. A sharp, localized pain in one specific spot, swelling around a joint, or pain that gets worse rather than better after a couple of days points toward something other than ordinary muscle soreness, possibly an injury like those covered in common running injuries. In that case, see a doctor or physiotherapist rather than assuming it's just DOMS and pushing through.
Browse upcoming events and plan your training load with recovery built in.
Browse eventsBased on what we see, mentions of soreness in support messages and community feedback seem to come up most in the days right after a big step-up long run, which fits the usual DOMS timeline. My honest take is that it's mostly a normal part of training that resolves on its own, though I'd never want anyone reading that as a reason to ignore pain that isn't following that pattern. If soreness is affecting whether you can make a race, checking your event's deferral policy early is generally more useful than waiting to see how you feel closer to race day.
Frequently asked questions
How long does DOMS usually last?
It typically peaks 24 to 48 hours after a harder or longer effort and gradually improves over the following days, usually resolving within about a week.
Should I run through DOMS?
Light, easy movement is generally fine and can even help. Very sharp or worsening pain, however, is different from normal soreness and is worth paying attention to.
Does DOMS mean my run was more effective?
Not necessarily. Soreness reflects unfamiliar load more than training quality, and consistent training without excessive soreness is just as effective over time.
How do I tell DOMS apart from an injury?
DOMS is usually symmetrical, widespread, and improves day by day. A sharp pain in one specific spot, swelling, or pain that worsens over time suggests something else and is worth having checked.