Is Your Post Workout Soreness Normal or a Warning Sign?
by: Chin Yi Khern, Physiotherapist, Regis Wellness
Last updated: March 16, 2026
What if the soreness you wear as a badge of honour after every workout is actually telling you nothing useful? And what if the one time it's trying to tell you something genuinely important, you dismiss it as "just DOMS" because you've trained yourself to ignore it?
Muscle soreness after exercise is one of the most common experiences in fitness. Almost everyone has felt it. And almost everyone has been told the same thing: it means the workout was good. It means you pushed hard enough. It means progress.
None of that is quite true. And in rare but serious cases, treating all soreness as normal can be genuinely dangerous.
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What DOMS Actually Is (and What It Isn't)
Delayed onset muscle soreness, or DOMS, is the stiff, tender, achy feeling that shows up roughly 12 to 24 hours after exercise and peaks somewhere between 24 and 72 hours. It usually fades by day five to seven. You feel it most when the affected muscle is stretched, contracted, or put under pressure. At rest, it's mostly quiet.
Most people still believe DOMS is caused by lactic acid buildup. That theory was debunked over twenty years ago. Cheung and colleagues showed in a 2003 review in Sports Medicine that lactic acid has nothing to do with it. Lactic acid clears from your muscles within about an hour of exercise. DOMS doesn't even begin until twelve hours later. They're on completely different timelines.
What actually causes DOMS is microscopic structural damage to muscle fibres, primarily from eccentric contractions. That's the lengthening phase of a movement: lowering a dumbbell during a bicep curl, the downhill portion of a run, the descent of a squat, controlling a shuttlecock overhead in badminton. When muscle fibres lengthen under load, tiny tears occur in the contractile proteins. This triggers a local inflammatory response, which is what produces the soreness, the stiffness, and the temporary loss of strength.
This process is normal. In fact, it's part of how muscles adapt and get stronger. The damage triggers a repair process that rebuilds the fibres slightly more resilient than before. That's the mechanism behind training adaptation. So far, so good.
The problem starts when people confuse the mechanism with the metric.
Why Soreness Doesn't Mean Your Workout Was Good
This is the misconception that refuses to die: if you're sore, you worked hard enough. If you're not sore, you wasted your time.
Schoenfeld and Contreras addressed this directly in a 2013 review in the Strength and Conditioning Journal. Their conclusion was clear. DOMS is a poor proxy for muscle growth. You can achieve significant strength and hypertrophy with minimal soreness. And you can be devastatingly sore from a session that produced almost no meaningful adaptation.
What soreness actually reflects is novelty. Your muscles encountered a stimulus they weren't accustomed to. That's it. A new exercise, a different rep range, a movement pattern you haven't done in months. The unfamiliarity is what drives the damage, not the effectiveness.
This matters for professionals who are short on time and want to know if their training is actually working. If you're measuring progress by how much pain you're in the next morning, you're tracking the wrong variable. Consistency, progressive overload, and performance improvement over weeks are what tell you the training is doing its job. Soreness tells you almost nothing about any of those.
The fittest, most consistent athletes you know are probably the least sore after training. Not because they're not working hard. Because their bodies have adapted to the demands. That's the goal. Not perpetual punishment.Your Body Adapts Faster Than You'd Expect
One of the most interesting and least discussed findings about DOMS is something called the repeated bout effect.
When you perform a bout of eccentric exercise for the first time (or the first time in a while), you get significant soreness. That part is predictable. But if you repeat the same exercise within the next few days to weeks, the soreness is dramatically reduced. Sometimes almost absent.
Your body learned from the first exposure. It adapted the muscle fibre structure, the neural recruitment pattern, and the connective tissue stiffness to handle that specific demand better. One session was enough to create a protective effect that lasts for weeks.
The practical implication is useful. The worst DOMS you'll ever get from a given exercise is the first time you do it. If you're consistently destroyed after every single workout, week after week, that's not a sign of good training. It usually means one of two things: either you're constantly varying the stimulus to the point where your body never adapts (which isn't always productive), or you're not recovering adequately between sessions. Both are worth looking at.
What to Do About Normal DOMS (and What Not to Do)
If it's just DOMS, you don't need to do much. Time is the primary healer. But there are a few things worth knowing.
Light movement helps. Going for a walk, doing a gentle swim, or performing low intensity versions of the same exercise increases blood flow to the damaged tissue and can reduce the perception of soreness. This is active recovery, and it works better than lying on the couch waiting for it to pass. We covered the science of why movement beats rest in our article on why resting a sports injury can make it worse.
Aggressive stretching doesn't help. Stretching a muscle that's already damaged from eccentric loading can actually increase the microtrauma. Gentle range of motion work is fine. Deep, prolonged stretching into pain isn't.
Anti-inflammatories are a grey area. Ibuprofen and similar drugs will reduce the soreness, but they may also interfere with the adaptive process. The inflammation is part of how muscles rebuild. Blunting it might make you feel better in the short term while slowing down the long term adaptation. For most people, save the anti-inflammatories for when the discomfort is genuinely affecting your daily function, not as a routine post workout habit.
Sports massage and deep tissue work can help with recovery between sessions, particularly when soreness is compounding from multiple training days. But as we discussed in our article on why massage wears off, if the same area is consistently problematic session after session, massage is managing the symptom while the underlying issue goes unaddressed.
And hydration matters more than most people realise, especially in Singapore. Exercising in heat and humidity increases muscle damage markers and amplifies DOMS severity. Staying well hydrated before, during, and after training is one of the simplest things you can do to reduce how sore you get.
When Soreness Stops Being Normal
Here's where the conversation gets more serious, and where most fitness content falls short.
There's a spectrum between "I did a hard workout" and "something is wrong." Most soreness lives at the harmless end. But not all of it does.
The first thing to watch for is soreness that doesn't follow the DOMS pattern. Normal DOMS peaks between 24 and 72 hours and fades steadily after that. If your pain is still intensifying on day four or five, or if it hasn't improved at all by day seven, that's outside the normal window and worth getting assessed.
Localised pain that only affects one side is another flag. If you did a bilateral workout (squats, deadlifts, running, cycling) and only one calf or one shoulder is sore, that's less likely to be DOMS and more likely to be an injury. DOMS tends to be roughly symmetrical because both sides did the same work.
Pain that's sharp, specific, or pinpointed to a single spot rather than spread across a muscle belly is worth paying attention to. DOMS feels like a broad, dull ache. A strain, a tendon irritation, or a joint issue feels different. It's more focused, often reproducible with a specific movement, and usually doesn't warm up the way DOMS does.
Recurring soreness in the same area, workout after workout, is not DOMS. It's a loading problem or a compensation pattern. Something in how you move is overloading a specific structure, and rest between sessions isn't enough for it to fully recover. This is one of the most common reasons people end up at our clinic. They've been writing it off as "just soreness" for months, and by the time they come in, the problem has progressed from irritation to an actual overuse injury.
The Far End of the Spectrum: Rhabdomyolysis
This is the risk most people have never heard of, and it's the reason treating all soreness as "just push through it" can be genuinely dangerous.
Rhabdomyolysis, or rhabdo, occurs when muscle fibres break down so severely that they release their contents into the bloodstream. A protein called myoglobin floods the kidneys, which aren't designed to filter it. The result can be acute kidney injury. In severe cases, it can be fatal.
It sounds extreme. It is extreme. But it's not as rare as people think, and doctors have reported an increase in cases linked to high intensity exercise: CrossFit, spinning, HIIT boot camps, and similar formats where people push past their limits without adequate conditioning.
The mechanism is the same as DOMS, just at a far greater magnitude. Eccentric exercise causes muscle fibre damage. With DOMS, the damage is microscopic and manageable. With rhabdomyolysis, the damage is extensive enough to overwhelm the body's repair systems.
Singapore's climate adds a compounding factor. Heat, humidity, and dehydration all increase the risk. So does the weekend warrior pattern: five sedentary days followed by an intense session with muscles that aren't conditioned for the load. It's the same training load spike we discussed in our article on why your weekend workout is the riskiest thing you do, just pushed to a medical extreme.
How to Tell the Difference Between DOMS and Rhabdomyolysis
The single most useful differentiator is this: DOMS hurts when you move the affected muscle. Rhabdomyolysis hurts at rest.
If your muscles are so painful that you can't straighten your arms, if the pain is constant and not just triggered by movement, if the affected area is visibly swollen and hard to the touch, those are warning signs that go beyond normal soreness.
The clearest red flag is urine colour. Dark brown, tea coloured, or cola coloured urine after intense exercise is a sign that myoglobin is being filtered by your kidneys, and it requires immediate medical attention. Don't wait to see if it resolves. Go to the A&E.
Other signs include extreme fatigue that feels disproportionate to the workout, nausea, and muscle weakness so severe that you can't perform basic tasks like gripping a cup or climbing stairs.
To be clear: rhabdomyolysis is uncommon. The vast majority of post workout soreness is just DOMS and it resolves on its own. But knowing these red flags exists, particularly if you're new to high intensity training, returning after a long break, or exercising hard in Singapore's heat, is the kind of knowledge that costs nothing to carry and could matter enormously the one time it's relevant.
Making Sense of What Your Body Is Telling You
Soreness is information. Not a trophy. Not proof of progress. Not something to chase and not something to ignore.
Normal DOMS is a familiar, bilateral, dull ache that peaks around day two and fades by day five. It responds to light movement and doesn't worsen with time. It tells you the workout was unfamiliar, not necessarily effective.
Pain that's one sided, sharp, localised, recurring in the same spot, or getting worse rather than better is your body sending a different message. One that's worth listening to before it becomes a bigger problem.
And at the extreme end, pain accompanied by swelling, weakness at rest, and dark urine is a medical situation, not a fitness badge.
Learning to read these signals, rather than lumping everything into "just sore from the gym," is one of the most practical skills you can develop as someone who trains regularly. Your body is communicating. The question is whether you're paying attention.
The Bottom Line
Most post workout soreness is harmless and temporary. But "most" isn't "all." Knowing the difference between DOMS and something more serious, and understanding what soreness actually tells you about your training, puts you in control of your recovery instead of guessing. If you're dealing with soreness that isn't resolving, pain that shows up in the same spot every time you train, or discomfort that doesn't match your effort level, a physio can figure out what's going on. Message us on WhatsApp to book. Better to check and know than to assume and be wrong.
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