DOMS vs Injury: How to Tell Muscle Soreness from Damage
Delayed onset muscle soreness (DOMS) is a dull, achy tenderness that builds the day after unaccustomed exercise and settles within about a week. An injury is more often sharp, local and obvious at the moment it happens, and it tends to get worse with use rather than easing. If your pain is sharp, swollen, bruised, getting worse or still there after a few days, treat it as a possible injury and get it assessed.
This guide sets out the differences in plain terms, how long each should last, what to do at home, and when to book a physiotherapist or call your GP.
TL;DR
DOMS usually appears 24 to 72 hours after exercise, feels dull and achy across a muscle, and fades within 5 to 7 days.
Injury pain is usually sharper, sits in one spot, may start during activity and can come with swelling, bruising or weakness.
Pain that is worsening, lasts beyond a few days, or stops you putting weight on a limb needs assessment.
Gentle movement suits DOMS. Sharp pain, swelling or a pop or snap needs rest and professional advice.
Our physiotherapists can assess an unclear pain and tell you whether it is safe to carry on training.
Table of Contents
What DOMS is and how it feels
DOMS is muscle pain and stiffness that develops 24 to 72 hours after exercise involving unaccustomed muscle loading. It is most associated with eccentric work, where the muscle lengthens under load: running downhill, lowering a weight, or the lowering phase of a squat.
People typically describe a dull, aching pain with tenderness, stiffness and some loss of strength. The same source notes symptoms peak at 24 to 72 hours and subside 5 to 7 days after exercise. NHS guidance describes DOMS as normally harmless.
Typical triggers include:
suddenly increasing how long, how often or how hard you train
changing your usual exercise
an inadequate warm-up
poor sleep
The usual picture is soreness in the muscles you worked, on both sides of the body, that feels worst when you first move and eases a little as you warm up. A new class, a return after a break or a first long hike are classic examples.
Scientists still debate exactly why it happens. A 2023 scoping review notes that the sensation is proposed to come from damage to muscle structure and connective tissue and inflammatory cells sensitising pain receptors, and that soreness does not correlate directly with the amount of damage in the muscle. In practice, that means a very sore muscle is not automatically a badly damaged one, and a mild ache does not prove everything is fine.
What an injury feels like
A muscle strain, sprain or tendon problem behaves differently. Guidance on acute muscle strains describes pain in the muscle belly, particularly when using or stretching it, tenderness along the muscle, swelling, bruising or redness depending on severity, and weakness or being unable to use the muscle.
The NHS lists symptoms of a sprain or strain as pain, tenderness or weakness, swelling or bruising, not being able to put weight on the injury or use it normally, and muscle spasms or cramping.
Other clues that point towards injury:
you can name the moment it happened, such as a sudden twinge while sprinting
the pain is sharp and in a small, specific area
it gets worse when you keep using the muscle
one side only is affected
you heard or felt a pop or snap
DOMS vs injury at a glance
Feature | DOMS | Likely injury |
Onset | Builds 24 to 72 hours after exercise | Often during activity, sudden |
Type of pain | Dull, aching, widespread across the muscle | Sharp, stabbing, in one spot |
Swelling or bruising | Not usually | Possible, depending on severity |
Effect of movement | Eases as you warm up | Worsens with use |
Strength | Temporarily reduced | Weakness, may be unable to use the limb |
Duration | Peaks at 24 to 72 hours, gone in 5 to 7 days | Lingers or worsens, weeks to months |
Sides affected | Usually both sides | Often one side |
No single feature settles it. A clinician diagnoses DOMS from your history and symptoms, and scans are seldom needed unless a complication such as rhabdomyolysis is suspected.
How long should soreness last?
Timescales are the most useful test, because DOMS follows a predictable curve.
24 to 72 hours: soreness builds and peaks.
2 to 5 days: aching and stiffness usually go away.
Up to 5 to 7 days: the upper end for symptoms to subside.
NHS patient guidance says soreness may last longer than the few days expected, and if it is persistent or worsening you should consult your physiotherapist, GP or 111.
Strains follow a different curve. Muscle strains usually take six to eight weeks to heal, though minor ones may feel much better within a couple of weeks and severe ones can take months. The NHS says most sprains and strains feel better after 2 weeks, and that running and similar strenuous exercise should be avoided for up to 8 weeks to reduce the risk of further damage.
If you are four or five days in and the pain is not clearly easing, or it has got worse since day two, DOMS becomes a less likely explanation.
How much soreness is too much?
Some discomfort after exercise is expected. York NHS physiotherapy guidance says aches 24 to 48 hours after using different muscles are normal, and should be told apart from an increase in your usual pain.
For runners, NHS physiotherapy advice says general soreness and slight discomfort that resolve within 24 hours are acceptable. By contrast, pain lasting more than 48 hours, worsening pain, persistent swelling or sharp pain are signs to reduce training.
A practical rule of thumb from these sources:
Soreness that is symmetrical, dull and improving daily is within the normal range.
Soreness that stops you walking normally, climbing stairs or sleeping deserves a closer look.
Pain that worsens each day, or that comes with swelling or bruising, is not typical DOMS.
Cumbria NHS guidance also points out that the old idea of “no pain, no gain” does not apply to exercise, and that pushing through symptoms will make them worse. Increases in symptoms lasting several days usually mean you have done too much.
What to do if it is DOMS
The aim is to stay gently active while the muscle repairs.
Keep moving lightly. Walking, easy cycling or mobility work can help. If activity is too painful, take a break for a few days.
Try massage. A review of recovery in older adults found that massage and cold-water immersion reduced soreness ratings 48 hours after exercise.
Be realistic about remedies. Ice, massage, acupressure and pain relievers may reduce pain, but they do not mean the muscle has fully recovered, so avoid jumping straight back to hard training.
Prevent a repeat. Build load gradually, warm up properly, protect your sleep and introduce new exercises at lower volume.
Sleep and nutrition both feed into recovery, and some people look at protein or collagen timing around training. If that interests you, this piece on collagen timing after a workout covers what to expect and when to resume strenuous activity.
If you are unsure whether your sore muscle is ready for another hard session, wait until the soreness has clearly settled and you can move the muscle through its full range without sharp pain.
What to do if it might be an injury
For a suspected sprain or strain, the NHS recommends PRICE therapy (Protection, Rest, Ice, Compression, Elevation) for the first 2 to 3 days, with ice for up to 20 minutes every 2 to 3 hours. It advises avoiding heat, alcohol and massage for the first couple of days.
NHS physiotherapy guidance on muscle strains uses the POLICE approach: protect with relative rest, then Optimal Loading by gradually increasing weight through the limb, with ice, compression and elevation. It suggests that starting exercises 2 to 3 days after a strain lets the initial inflammation settle, while waiting too long to move the limb may slow recovery.
For a groin strain, guidance says that in the first 48 hours you should rest from aggravating activities, use ice and compression and, if pain is improving after that, begin gentle exercises.
For more on using ice safely, see our guide to ice after injury and when to see a physio. If your injury is a muscle tear, muscle rupture recovery time explains what to expect. Specific areas are covered in our guides to calf strain treatment, hip flexor strain recovery and groin strain rehab.
Professional consensus guidelines on muscle injuries recommend that rehabilitation be supervised by an experienced physiotherapist, delivered in the absence of pain and respecting the healing process. They also advise against applying heat to the muscle until a structural injury has been excluded.
When to get medical help
Some signs should not wait.
Go to A&E straight away for sudden swelling, redness, heat and pain in the calf, severe pain after an injury, or being unable to put weight on the leg.
Contact your GP or call 111 if:
the pain is very painful or worsening, or self-treatment has not helped
swelling or bruising is severe or getting worse
it hurts to put weight on the injury
you have a high temperature and feel hot and shivery
you think you have ruptured a tendon or heard a pop or snap when the pain started (NHS-aligned advice)
NHS physiotherapy guidance also says that if exercises are making symptoms worse, take a break and speak to your GP, who may refer you to a physiotherapist.
Dark urine alongside severe muscle pain and weakness after very hard exercise is a reason to seek urgent medical advice, because DOMS is only investigated when rhabdomyolysis is suspected.
Our perspective
In clinic, the most common mistake we see is not ignoring a real injury. It is guessing. People either rest a straightforward case of soreness for a fortnight, or train through a strain that needed a plan from day one. We would rather you came in early. A physiotherapy assessment takes the history, tests the muscle’s strength and range, and tells you which of the two you are dealing with. If it is soreness, you leave knowing it is safe to carry on. If it is a strain, you leave with graded exercises and clear return criteria. Our multidisciplinary team has treated sports and everyday injuries across Bedfordshire and Buckinghamshire since 1986. Where imaging is needed, we can refer you quickly. Where the issue is load, we help you plan training so the next block of exercise does not catch you out. Ivan
See a physio if you are not sure
If your pain has not clearly eased within a few days, or you are not sure which category it falls into, a physiotherapy assessment is the quickest way to find out. At Parks Therapy Centre, a physiotherapy assessment costs £76 and follow-up treatment sessions £67. We accept all major health insurance plans, so check your policy before you book.
If you want to build strength to reduce the chance of repeat problems, our Pilates classes run at several of our locations. You can also find more on our home page, including online booking.
FAQ
What does DOMS pain feel like?
DOMS feels like a dull, deep ache with tenderness and stiffness in the muscles you worked. It starts a day or so after exercise and is usually worst around 24 to 72 hours. Gentle movement often makes it feel a little better.
How do I tell DOMS from a muscle strain?
Look at onset, location and trend. DOMS builds a day later, is spread across the muscle and improves. A strain often starts suddenly, is sharp and local, may swell or bruise, and worsens with use. If you cannot tell, a physiotherapist can examine you.
How long should muscle soreness last?
Most DOMS fades in 2 to 5 days and should be gone within about a week. If pain is persistent or worsening beyond that, speak to a physiotherapist, your GP or 111.
Should I exercise with DOMS?
Light activity can help, but avoid hard sessions on very sore muscles. If activity is too painful, take a few days off. Sharp pain, swelling or weakness means stop and get it checked.
Sources
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