What is DOMS? A quick guide to next-day soreness
That stiff, tender feeling a day or two after a hard session has a name. What causes it, how long it lasts, and what actually helps.
You felt fine walking out of the gym. The next morning, the stairs are a negotiation. That is DOMS: delayed-onset muscle soreness. It is one of the most common things active people feel, and one of the most misunderstood.
The short version
- DOMS usually starts 12 to 24 hours after exercise and peaks around 24 to 72 hours.
- It is most common after new exercises, a big jump in load, or lots of lowering movements.
- It is not caused by lactic acid.
- Gentle movement, sleep, food and water help most. It normally fades within a few days.
What causes it?
When muscles work harder than they are used to, especially while lengthening under load (lowering into a squat, running downhill, the way down of a push-up), tiny bits of microscopic damage occur in the muscle fibres. The body responds with a repair process that includes some local inflammation and sensitivity. That sensitivity is what you feel as soreness and stiffness.
This is a normal part of adapting. The same session done again a week later usually causes much less soreness, which is called the repeated bout effect.
The lactic acid myth
Lactate clears from your muscles within an hour or so after exercise. It cannot be the reason you are sore two days later. So you don't need to "flush out lactic acid". You need to give the muscle time and the right conditions to repair.
What helps
- Keep moving, gently. A walk, easy cycling or light mobility often eases stiffness better than total rest.
- Sleep and eat well. Repair needs protein, energy and time.
- Stay hydrated. Dehydration makes everything feel worse.
- Massage and topicals. Rubbing the area, a foam roller, or a cooling and warming gel can make soreness feel easier while it settles.
- Ease back in. Train a different area, or the same area lighter, rather than repeating the session that caused it.
How to avoid the worst of it
Increase load gradually, especially with new exercises. Add a short warm-up and an easy cool-down. Be extra careful after a long break, a new sport, or a weekend tournament when you play far more than usual.
DOMS or injury?
| Usually DOMS | Get it checked |
|---|---|
| Dull, achy, tender to touch | Sharp or stabbing pain |
| Both sides, across the whole muscle | One specific spot, often near a joint |
| Starts the next day | Starts suddenly during activity, maybe with a pop |
| Eases with gentle movement | Gets worse with movement, visible swelling or bruising |
| Fades in 3 to 5 days | Lasts more than a week |
This guide is general information, not medical advice. If pain is sharp, severe, follows an injury, or lasts more than a week, see a doctor or physiotherapist.
