- DOMS usually peaks 24 to 72 hours after training and fades within about five days.
- New exercises and heavy lowering phases cause most of it, not lactic acid.
- Gentle movement, sleep and enough food help more than gadgets.
- Sharp, one-sided or worsening pain is not DOMS and is worth getting checked.
What DOMS actually is
Delayed onset muscle soreness (DOMS) is the stiff, tender ache that turns up the day after a session and often feels worst on day two. It usually peaks somewhere between 24 and 72 hours after training, then fades over the next few days. Stairs become a negotiation, sitting down takes planning, and lifting your arms to wash your hair feels like a workout of its own.
It is not lactic acid. Lactate is cleared from the blood within an hour or so of finishing a session, long before the soreness arrives. The current understanding is that DOMS comes from small-scale disruption to muscle fibres and the connective tissue around them, followed by an inflammatory repair process that makes nerve endings in the area more sensitive. That is why the muscle hurts when you press or stretch it but feels fine when you keep still.
The key point is simple. DOMS is a normal response to unfamiliar work. It is not a sign of injury, and it is not a measure of how good the session was.
Why some sessions leave you wrecked and others do not
Two things drive DOMS more than anything else: novelty and eccentric loading. Eccentric work is the lowering or lengthening part of a movement, such as the way down in a squat, the lowering phase of a Romanian deadlift, or running downhill. Muscles produce high forces while lengthening, and that is the type of work most likely to leave you sore.
- A new exercise, or one you have not done for a few weeks
- A big jump in volume, for example going from three sets of lunges to six
- Lots of lowering under load: walking lunges, Romanian deadlifts, Nordic curls
- Downhill running, or a first go at sandbag lunges and wall balls in a HYROX session
- Coming back after a holiday, an illness or a busy spell at work
The good news is something called the repeated bout effect. After one sore session, the same session a week or two later produces far less soreness, even at the same load. That is why your first month of training tends to hurt more than month six, and why people who train consistently rarely get floored unless they change something big. If you are new and wondering whether the ache after your first week is normal, our guide to being sore after your first workout covers it in more detail.
What genuinely helps
Nothing makes DOMS disappear overnight, and time does most of the work. A few things make those days more comfortable and help you keep training.
- Gentle movement. A 20 to 30 minute walk, an easy bike or a swim usually eases stiffness for a few hours. This is the idea behind active recovery.
- Sleep. Poor sleep increases pain sensitivity, so a couple of bad nights makes the same soreness feel worse.
- Enough protein and total food. Around 1.6 to 2.2 g of protein per kg of body weight a day, spread across meals, supports repair. Our guide to eating for recovery turns that into real meals.
- Warmth. A warm bath or shower often feels good and does no harm.
- Sensible progression. The best cure is prevention: add volume gradually, especially with lowering-heavy exercises.
What helps less than the marketing suggests
Foam rollers, massage guns and compression tights can reduce how sore you feel for a short while. The effects in research are small and short-lived, and none of them meaningfully speeds up the repair itself. If you enjoy them and they make you more willing to move, use them. If not, you are not missing much. We look at the evidence properly in what foam rolling does and does not do.
Anti-inflammatory painkillers such as ibuprofen are a different question. They may take the edge off, but using them routinely to dull training soreness is not a good habit and is not risk free, particularly for your stomach and kidneys. If you need painkillers to get through a normal week of training, the programme is too much for you right now. A pharmacist or GP can advise on medication.
Stretching does little for DOMS either. Research reviews have found it makes little or no difference to next-day soreness, even though it can feel pleasant at the time.
Should you train while sore?
Usually, yes, with some common sense. Mild to moderate DOMS is not a reason to skip a session. Once you are warm, the ache often fades noticeably, and many people find the first ten minutes are the worst part.
What changes is the choice of work. If your legs are very sore after a Monday lower-body session, an upper-body session on Tuesday is ideal. If you are only a bit stiff, you can train legs again at a slightly lower load. Severe DOMS, where you cannot move through a normal range, is a sign to train something else, go for a walk, and progress more gradually next time.
At Lycan Strength, Upper classes run on Tuesday and Wednesday and Lower classes on Thursday, which gives sore muscles time to settle while you work others. Every class is scalable, so a coach can lighten the load when you turn up stiff. You can see how the week fits together on the class timetable.
When soreness is not DOMS
DOMS is usually spread across a muscle, often on both sides, and improves steadily day by day. Pain that behaves differently deserves attention.
- Sharp or sudden pain during a lift, especially with a pop or a tearing feeling
- Pain in one specific spot rather than a general ache across the muscle
- Pain in a joint rather than the muscle around it
- Swelling or bruising
- Soreness that is getting worse after day three instead of better
These are more likely to be a strain or another problem, and a physiotherapy assessment is a sensible next step. Rarely, extreme exercise leads to rhabdomyolysis, where muscle breaks down badly enough to affect the kidneys. Warning signs are severe pain and swelling far beyond normal soreness, marked weakness, and dark urine the colour of tea or cola. That needs urgent medical help: go to A&E, or call 999 if you feel very unwell.
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Questions
How long does DOMS last?
Most DOMS peaks 24 to 72 hours after training and is gone within about five days. If it is getting worse after the third day, or is focused on one spot, it may be something other than DOMS.
Does DOMS mean I had a good workout?
No. Soreness mostly reflects how new or eccentric-heavy the session was, not how effective it was. You can make excellent progress while rarely being sore.
Is it lactic acid that makes you sore the next day?
No. Lactate is cleared within about an hour of training. Next-day soreness comes from minor muscle disruption and the repair process that follows.
Should I take ibuprofen for DOMS?
It is not usually needed, and taking it routinely for training soreness is not a good habit. If you are unsure whether a medication is right for you, ask a pharmacist or your GP.
General guidance for healthy adults. If you have a medical condition, injury or are pregnant, check with a health professional before changing your training or diet.
