That stiff, achy feeling that peaks a full two days after a workout, rather than the next morning, catches a lot of people off guard. It has a specific name and a well-understood cause, and it is almost always a normal part of how muscles adapt and grow stronger.
Quick Answer
Soreness that peaks around 48 hours after exercise is called delayed onset muscle soreness (DOMS). It happens when unfamiliar or intense exercise creates microscopic tears in muscle fibres, triggering an inflammatory repair process that causes stiffness and tenderness.
What Causes DOMS?
When muscles are worked harder than they are used to, particularly during eccentric movements like the lowering phase of a squat, tiny tears form in the muscle fibres. The body responds with inflammation to repair the tissue, which is what causes the delayed stiffness and tenderness. This is a normal, healthy part of how muscles adapt and grow stronger over time.
Why It Peaks on Day Two, Not Day One
- Inflammatory response builds over time: The repair process ramps up over the first 24 to 48 hours rather than starting instantly.
- Fluid buildup in tissue: Swelling around the damaged fibres increases gradually, adding to the pressure and stiffness felt on day two.
- Nerve sensitisation: Pain receptors in the area become more sensitive as inflammation progresses, which is why the soreness often feels worse before it improves.
What Makes DOMS Worse
New or Unfamiliar Exercise
Trying a new activity, or returning after a long break, is one of the most common triggers, since the muscles are not adapted to the specific movement pattern. Increased activity also raises the body’s energy needs. See our guide on why you might feel hungry all the time.
Eccentric Movements
Lengthening a muscle under load, such as lowering a weight slowly or running downhill, causes more microscopic damage than shortening movements, making eccentric-heavy workouts a common DOMS trigger.
Increasing Intensity or Volume Too Quickly
Sharp jumps in weight, reps, or duration outpace what the muscles are conditioned to handle, increasing the likelihood of significant soreness.
How to Ease DOMS
- Keep moving with light activity, gentle walking or stretching improves blood flow and can ease stiffness
- Stay well hydrated, since fluid supports tissue repair
- Get adequate protein to support muscle recovery
- Try a warm bath or light massage to relax tight muscles
- Prioritise sleep, since most tissue repair happens during rest
- Avoid training the same muscle group at high intensity until soreness has eased
When Muscle Soreness Might Not Be DOMS
Ordinary DOMS is dull, symmetrical, and improves within three to five days. Certain signs suggest something more serious. Persistent muscle fatigue can also overlap with everyday tiredness. See our guide on why you might feel tired all the time.
- Sharp, localised pain rather than general soreness
- Significant swelling, bruising, or visible deformity
- Soreness lasting more than a week without improvement
- Dark or reduced urine output alongside severe soreness, which can rarely indicate rhabdomyolysis
- Pain that worsens rather than improves over the days following exercise
These signs warrant medical attention rather than home management.
FAQs
Is it bad to work out again while still sore?
Light activity is generally fine and can even help recovery, but high-intensity training on the same muscle group is best delayed until soreness has significantly eased.
Does stretching before a workout prevent DOMS?
Not reliably. Research shows stretching has little effect on preventing DOMS, though a proper warm-up and gradual increases in intensity do help reduce it.
Why don’t I get sore anymore from my usual workout?
As muscles adapt to a specific exercise through repeated exposure, they become more resistant to the micro-damage that causes DOMS, which is why familiar workouts cause less soreness over time.
Conclusion
Soreness that peaks two days after exercise is a normal sign that your muscles are adapting and rebuilding, not a sign that something has gone wrong. Light movement, hydration, and rest are usually all it takes to recover, but sharp or worsening pain is worth having checked rather than pushed through.
This article is for general information only and is not a substitute for professional medical advice. If soreness is severe, sharp, or lasts beyond a week, please speak to a GP.
