Primagevity  ·  Learn — general information, not medical advice Join the waitlist →
Recovery & repair

DOMS explained: why muscles get sore.

That deep ache a day or two after a hard or unfamiliar session has a name — delayed-onset muscle soreness. Here's what it is, how long it really lasts, and what genuinely helps.

General information ~6 min read
Key takeaways
  • DOMS is a normal response to unfamiliar or harder training — not an injury.
  • It typically starts 12–24 hours later, peaks at 24–72 hours, and settles within about a week.
  • Light movement, sleep and time are the mainstays; there's no instant fix.
  • Soreness is not a measure of how good your workout was.
  • Build up gradually and it hits less hard next time.

If you've started something new, come back after a break, or pushed a bit harder than usual, you'll know the feeling: fine on the day, then stiff and tender 24–48 hours later. That's DOMS — delayed-onset muscle soreness — and it's one of the most common (and most misunderstood) parts of training.

What DOMS actually is

DOMS is the muscle discomfort that develops in the day or two after activity your body isn't used to. It's a normal part of how muscle adapts, not a sign of damage in the way an injury is. When a muscle takes on more load than it's prepared for — especially "eccentric" work, where the muscle lengthens under tension, like the lowering phase of a squat or running downhill — it causes small-scale disruption to the muscle and surrounding tissue, a brief inflammatory response, and the temporary soreness you feel while it repairs and adapts.

The important word is temporary. DOMS comes with starting something, progressing, or returning after time off, and it tends to fade as your body gets used to the work — the same session that wrecks you in week one barely registers a month later.

How long it lasts

The pattern is fairly consistent: soreness usually begins 12 to 24 hours after the session, is at its worst around 24 to 72 hours in, and eases off within roughly 5 to 7 days as the muscle recovers and adapts. If you're still genuinely sore well beyond a week, or it's getting worse rather than better, that's worth a second look (see below).

What actually helps

There's no switch that turns DOMS off, but a few things make it more comfortable while it runs its course:

  • Gentle movement. Easy activity — a walk, light spin, mobility work — often eases soreness better than lying still. Keep it light.
  • Sleep. It's where a lot of repair happens; aim for the Sleep Health Foundation's 7–9 hours.
  • Hydration and food. Stay hydrated and eat normally, with enough protein to support repair.
  • Comfort measures. Gentle heat, a warm shower or light massage can feel good; use what you like, without expecting miracles.
  • Time and gradual progression. The real fix is to build load up gradually so each step is something your body can handle.

What doesn't help (and a myth to drop)

You can't reliably prevent DOMS when you do something genuinely new — and that's fine, it's part of adapting. Pushing hard into a very sore muscle to "work it out" tends to backfire. And the big myth: soreness is not a scorecard. A productive session doesn't have to leave you sore, and being sore doesn't prove a session was effective. Judge training by progress over weeks, not by how much you ache the next morning. (More on that in how to recover faster after a workout.)

When it's more than DOMS

Ordinary DOMS is a dull, both-sides ache that improves over a few days. Get it checked if you have sharp, one-sided or joint pain, noticeable swelling, soreness that isn't improving after a week, or pain that stops you using the limb normally. Rarely, after extreme or unaccustomed exertion, severe pain with marked swelling and unusually dark (cola-coloured) urine needs urgent medical care — don't wait on that one. When in doubt, speak with a health professional or call healthdirect on 1800 022 222.

The bigger picture

DOMS is one visible sign of a much larger process — your body adapting to training. Managing it well is really just managing recovery and load well. For the full picture, read our complete guide to training recovery.

Prefer a plan that progresses you sensibly — built around your goals and overseen by Australian-registered practitioners?

Join the waitlist →

Common questions

How long does DOMS last?
It usually starts 12–24 hours after a session, peaks around 24–72 hours, and settles within about 5–7 days as the muscle adapts.
Is it OK to exercise with DOMS?
Usually yes, with lighter or different activity — gentle movement often helps more than complete rest. Avoid heavily loading a very sore area until it settles, and stop if pain is sharp rather than a dull ache.
How do I get rid of DOMS fast?
There's no instant fix, but light movement, sleep, hydration and gentle heat or massage make it more comfortable while it resolves. Building training up gradually is the best way to reduce how hard it hits next time.

Sources

  1. healthdirect (Australian Government) — exercise, muscle soreness and when to seek help; healthdirect helpline 1800 022 222. healthdirect.gov.au
  2. Better Health Channel (Victorian Government) — physical activity and recovery. betterhealth.vic.gov.au
  3. Sleep Health Foundation — sleep and recovery. sleephealthfoundation.org.au

Keep reading

Pillar

The complete guide to training recovery

What recovery is and the five levers that move it.

 Recovery

How to recover faster after a workout

The tactics that genuinely speed things up — and the ones that don't.
Now forming · Australia

Progress without the wreckage.

A plan that builds you up sensibly, shaped around your goals and overseen by Australian-registered practitioners. Join the waitlist.

Join the waitlist →