If you’ve ever hobbled down the stairs after leg day and wondered whether that soreness means the workout worked, here’s the reassuring answer: soreness is not a scoreboard. Research reviews on delayed-onset muscle soreness (DOMS) describe it as a temporary response to unfamiliar or eccentric-heavy exercise, but it’s not a reliable measure of muscle growth. You can make progress with little soreness, and a very sore session doesn’t automatically mean you’ve gained more.
Table of contents
- What DOMS feels like, and why it happens
- Does muscle soreness mean muscle growth?
- Why the same workout hurts less next time
- How to relieve muscle soreness without overcomplicating it
- Can you train when you’re sore?
- How to ease into the first weeks of a new routine
- When soreness might be a warning sign
- Recommended reading
- Train well with Fitness Health
What DOMS feels like, and why it happens
DOMS is the muscle tenderness, stiffness, and sometimes temporary weakness that can show up after an unfamiliar or demanding workout. It usually develops several hours after exercise and often feels strongest around 24–72 hours later. The exact biological process isn’t fully settled, but it involves stress to muscle structures and a local inflammatory response, which can make movement and pressure feel uncomfortable.
It’s more likely after a new exercise, a sudden jump in training volume, or lots of eccentric work: the part of a movement where a muscle produces force as it lengthens, like lowering into a squat or bringing a dumbbell down in a curl. The American College of Sports Medicine (ACSM) explains why unfamiliar, eccentric-heavy exercise can cause soreness and temporary reductions in muscle function.
And no, DOMS isn’t lactic acid sitting in your muscles. Lactate rises during hard exercise, but it clears relatively quickly. That doesn’t fit the usual delay before DOMS appears. Research on lactate and delayed soreness does not support lactic acid as the cause.
Does muscle soreness mean muscle growth?
No. Soreness can follow a workout that challenges you in a new way, but it can’t tell you how much muscle you’ll build. A research review on muscle damage and remodelling explains why muscle damage and soreness aren’t requirements for growth. A separate study on DOMS and eccentric exercise found that soreness didn’t reliably reflect the amount of muscle damage.
A more useful way to judge your training is to look at what you can do over time: are you gradually adding reps or load while keeping your technique solid? Are you training consistently and recovering well enough to return for the next session? Those signals tell you more than whether you wince getting out of a chair.
Chasing soreness can lead to a frustrating cycle: swapping exercises every week, piling on extra sets, or treating every workout as a test of toughness. If you’re getting stronger while soreness fades, that’s often a sign your body is adapting, not that your programme has stopped working. For practical guidance on measuring progress, see our post on progressive overload mistakes.
Why the same workout hurts less next time
The first time you try a new workout, it may leave you surprisingly sore. The next time, the same session can feel much easier. That’s the repeated-bout effect: after your body has experienced a particular challenge, it tends to be less sore and less disrupted by repeating it.
This is normal adaptation, not a sign that you’re weaker or that the workout has stopped counting. In fact, the reduction in soreness is one reason experienced lifters may rarely feel wrecked by familiar sessions. A review of repeated-bout research describes how an initial bout of eccentric exercise can help protect against muscle damage in later bouts.
How to relieve muscle soreness without overcomplicating it
There’s no magic switch that makes DOMS vanish, and most soreness improves with time. A few simple habits can make the wait more comfortable:
- Try easy movement. A relaxed walk, gentle cycle, or easy mobility session may help you feel less stiff. Keep it light; it’s not the day to sneak in another hard workout.
- Prioritise sleep and regular meals. Give your body time and enough overall energy and protein to support normal training recovery. Supplements aren’t a substitute for those basics.
- Keep hydration sensible. Drink to thirst and replace fluids lost through exercise. Forcing large amounts of water won’t make sore muscles recover faster.
- Consider massage or foam rolling for comfort. Research suggests massage can modestly improve how sore people feel. Foam rolling may also offer short-term relief or make movement feel easier, but neither should be mistaken for a fast-forward button on muscle repair.
- Don’t stretch aggressively into pain. Stretching hard on a very sore muscle isn’t a reliable fix and may simply feel worse.
Compression garments may offer small improvements in perceived recovery for some people, but the effect is not a guarantee. And if you’ve heard that an ice bath is a must after lifting, it isn’t. Cold immersion may help with short-term soreness in some situations, but using it straight after strength training repeatedly could interfere with adaptation. The ACSM discusses that trade-off in its piece on cold-water immersion.
Can you train when you’re sore?
Often, yes, if the soreness is mild and you can move normally enough to keep good form. You might train a different muscle group, take an easy walk, or do a lighter session that doesn’t push the sore area hard. If your technique changes to avoid discomfort, or your movement feels restricted, scale back or rest that area.
For example, mildly sore legs don’t automatically rule out an upper-body session. But if a sore muscle is painful through its working range, forcing heavy sets is unlikely to improve your training day. Don’t treat “I can technically lift it” as the same thing as “I can lift it well.”
How to ease into the first weeks of a new routine
A common reason people ask “why am I so sore after working out?” is that they’ve returned after a break or started a programme with a big jump in unfamiliar exercise. It’s tempting to make up for lost time in one session. Your body may have other plans.
For the first couple of weeks, keep the exercise selection familiar where you can, use manageable loads, and resist the urge to add lots of sets or new movements all at once. You don’t have to avoid challenging training; just give your body room to adjust. If a new session leaves you so sore that it disrupts the rest of your week, that’s useful feedback to reduce the next session’s volume or intensity.
Our article on getting back into the gym after a break covers returning gradually. For more on controlled lowering phases, which can make a new workout especially soreness-heavy, read about tempo training and time under tension.
When soreness might be a warning sign
Ordinary DOMS generally affects the muscles you trained and eases over a few days. Don’t assume every ache is normal soreness, though. Get medical advice if pain is sharp or very localised, centred in a joint, getting worse instead of improving, or still significant after about five days. If a health problem persists, speak with your GP rather than trying to train through it.
Seek urgent medical care if you have severe muscle pain or swelling that feels far beyond what the workout would explain, marked weakness, or tea- or cola-coloured urine after exercise. These can be signs of rhabdomyolysis, a rare but serious condition. The CDC advises seeking medical attention immediately if you have symptoms such as unexpectedly severe muscle pain, dark urine, or unusual weakness or tiredness.
Recommended reading
Explore the Fitness Health Strength & Fitness blog for more training guidance, including progressive overload and tempo training. If you’re building a more balanced routine, our Energy blog has practical articles on everyday training and recovery.
Train well with Fitness Health
Good training is built on consistency, not on chasing a particular level of soreness. Fitness Health shares practical, science-first guidance to help make everyday wellness easier to navigate. Browse the Fitness Health website for more.
The takeaway: DOMS is a normal response to some new or challenging workouts, but it isn’t proof of muscle growth. Keep track of your training, build up gradually, and let your progress, not your pain, tell you whether your plan is working.
Meta description: Muscle Soreness Explained: What DOMS Means for Your Gains (and What It Doesn't). Learn why soreness happens, whether DOMS means muscle growth, how to ease discomfort, when to train, and which warning signs need medical attention.
This article is for general information only and is not medical advice. Consult a qualified healthcare professional about health concerns, and seek urgent care for possible rhabdomyolysis symptoms.
