You take a rest day for a week, ease back into the gym with a moderate leg workout, and the next morning you can barely walk down stairs. Meanwhile, someone else in your life seems to do the exact same thing and just shrugs it off. It’s easy to assume that’s a fitness level difference, but soreness intensity isn’t just about how in shape you are. Part of it comes down to how your body processes and perceives pain in the first place.
This is a slightly different question than how fast you recover. Two people can heal at roughly the same underlying rate but experience wildly different levels of discomfort along the way, because pain perception itself is genetically variable.
What Causes Differences in Post-Exercise Soreness
Delayed-onset muscle soreness, usually called DOMS, typically peaks somewhere between 24 and 72 hours after unfamiliar or intense exercise. It happens because of microscopic damage to muscle fibers combined with a local inflammatory response, both of which trigger nerve signals that your brain interprets as soreness. How intensely your brain interprets those signals is where genetics comes into play.
The COMT Gene
One of the more studied genes in pain perception research is COMT, which provides instructions for an enzyme that helps break down certain neurotransmitters, including dopamine, involved in how the nervous system processes pain signals. Certain COMT variants are associated with higher baseline pain sensitivity, meaning the same amount of tissue damage can register as more intense discomfort. This gene has been studied extensively in chronic pain research, but the same underlying mechanism applies to garden-variety muscle soreness too.
Nerve Sensitivity Genes
Genes affecting proteins like TRPV1, which is involved in how nerve endings detect and transmit signals related to heat, pressure, and tissue irritation, also play a role. People with more sensitive versions of these pathways may notice soreness sooner and more intensely, even when the underlying muscle damage is comparable to someone with less sensitive nerve signaling.
Put together, this means two people can have essentially the same amount of microscopic muscle damage after a workout and walk away with very different subjective soreness experiences, simply because their nervous systems are interpreting the same signals differently.
How Common Are These Genetic Differences
Pain sensitivity variation is extremely common and sits on a wide spectrum across the population, rather than sorting people into two clean groups. Studies using standardized exercise challenges, like a set number of squats or eccentric bicep curls performed by people with no recent training history, consistently find a wide range of reported soreness intensity even when researchers control for training background, sex, and age, pointing strongly toward a genetic contribution layered on top of the physical damage itself.
Does Soreness Intensity Affect Your Health
Feeling more soreness isn’t inherently a health problem, and it doesn’t necessarily mean more actual tissue damage occurred. That said, people who experience intense soreness sometimes avoid exercise altogether to sidestep the discomfort, which can work against long-term fitness and health goals. On the other end, people who barely feel sore at all sometimes underestimate how much recovery their muscles genuinely need, since the absence of pain doesn’t always mean the absence of microscopic damage still being repaired.
What Your Soreness Sensitivity Means for You
If workouts consistently leave you far more sore than they seem to leave everyone else, it’s not a sign that you’re out of shape or doing something wrong. Your nervous system may simply be wired to register those signals more strongly. If you’re curious about your own pain sensitivity tendencies, a DNA-based report can offer useful context, whether that means adjusting your warmup routine, easing into new exercises more gradually, or just knowing what to expect.
Frequently Asked Questions
Does More Soreness Mean a Better Workout?
Not necessarily. Soreness is one signal that your muscles experienced some degree of new stress, but it’s a poor measure of workout quality on its own. You can build strength and muscle effectively without extreme soreness, and being very sore doesn’t automatically mean better results.
Can I Reduce How Sore I Get if It’s Genetic?
Yes, to some extent. Gradually progressing exercise intensity, staying well hydrated, prioritizing sleep, and incorporating a proper warmup can all reduce soreness intensity, even if your underlying genetic sensitivity stays the same.
Is Soreness Sensitivity Related to Pain Tolerance in General?
They’re related but not identical. Pain sensitivity refers to how strongly your nervous system registers a given signal, while pain tolerance refers to how well you’re able to push through or endure that sensation once it registers. Genetics influences both, but they involve somewhat different mechanisms.
Why Do I Get Sore Even From Workouts I’ve Done Before?
Even familiar workouts can cause soreness if you increase the weight, volume, or intensity beyond what your muscles have recently adapted to. Highly sensitive individuals may notice this more readily than people with lower baseline sensitivity, even from relatively small increases.
Does Age Change How Sore I Get?
Recovery capacity does shift somewhat with age, but pain sensitivity itself tends to be a fairly stable, genetically influenced trait throughout adulthood. Many people notice their general soreness pattern has stayed fairly consistent since their younger training years.
Sore or not, the work still counts. Your muscles are adapting either way, even if your nervous system insists on making sure you notice.
