You left the table loose and warm, slept well, and then woke up the next morning feeling like you’d been through a hard workout. If you have searched for an explanation of muscle soreness after a massage, you have almost certainly been told it’s lactic acid being “flushed out” of your tissue. That explanation is everywhere. It is also wrong, and it has been wrong since the 1980s.
Here is what the research actually shows, how long the ache should last, and the small things that make the difference between a tender day and a rough one.
Where the lactic acid story came from
Lactate is real, and your body does produce more of it during hard effort. The leap that got made — sometime in the mid-20th century, and then repeated in a million spa brochures — was that lactate is a waste product that sits in muscle and causes pain until something squeezes it out.
The timing alone kills the theory. Lactate clears from your bloodstream within roughly an hour of stopping the activity that produced it. Post-massage or post-workout soreness usually doesn’t even start for six to twelve hours, and peaks a day or two later. By the time you’re sore, there is nothing left to blame. Researchers have looked directly at whether blood lactate tracks with delayed soreness and found no relationship.
Lactate isn’t even waste. Your heart, brain and other muscles take it up and burn it as fuel. So when a therapist or a blog tells you they’re “working the lactic acid out,” they’re using a metaphor that stopped being accurate a long time ago.
What’s actually causing muscle soreness after a massage
What you’re feeling is almost certainly delayed onset muscle soreness — the same thing that shows up after a new workout. Cleveland Clinic describes DOMS as pain that sets in one to three days after you stress a muscle in an unfamiliar way, caused by tiny disruptions in the muscle fibers and the repair response that follows.
Sustained pressure on a muscle that hasn’t been worked in a while is an unfamiliar stress. Your therapist is compressing tissue, holding it, and moving it through ranges it hasn’t visited lately. That’s mechanical input, not chemical drainage. Your body responds the way it responds to any new mechanical input: a bit of tenderness while it sorts itself out.
Worth being honest about the limits here — the exact mechanism behind DOMS is still argued over in the research, with some recent work pointing at irritated sensory nerves rather than the muscle fibers themselves. What isn’t argued over is that it isn’t lactic acid, and that it resolves on its own.
A few patterns make muscle soreness after a massage more likely:
- It’s been a long time. Six months between sessions and the first one back will almost always be the tender one. The second, three weeks later, usually isn’t.
- Deeper work. Deep tissue concentrates firm pressure on specific muscle groups, so it produces more of this than a flowing Swedish session does.
- You didn’t say anything. By far the most common cause we see. The pressure was more than you wanted, you decided it was fine, and you found out the next morning that it wasn’t.
- You went straight back into a hard workout. Stacking a heavy leg day onto a deep session on your legs is asking for it.
How long it should last
A useful rule: onset within about 6 to 12 hours, peak somewhere in the 24-to-48-hour window, mostly gone by day three. It should feel like tenderness — sore to press on, a little stiff getting out of a chair — not like an injury. If you can trace the ache to the specific areas that got worked, that’s the expected pattern.
Bruising is a separate question with its own answer; we cover bruising after a session in more detail, and it’s worth reading if that’s what you’re actually seeing.
How we try to prevent muscle soreness after a massage
Most of the prevention happens in the first five minutes, before anyone touches you.
When you check in, your therapist will ask what you want out of the hour and where you’re holding tension. That is not small talk — it’s how pressure gets set. If you say “I sit at a desk and my shoulders are wrecked,” you’ll get a different hour than if you say “I just want to fall asleep.”
The single most useful thing you can do is give a number. Ask for pressure on a 1-to-10 scale and name yours out loud: “I want about a 6, and tell me if my traps feel like more.” Therapists are calibrating against a body they’ve never worked on before, and a number travels much better than “a little firmer.” If it crosses into wincing or holding your breath, that’s past useful and into the range that produces a sore tomorrow — say so mid-session. Nobody is offended. Adjusting pressure is the job.
A few practical notes on our end: sessions start from $69 and the full menu is on the services page, so a first-time visit doesn’t have to be an expensive experiment. If you’re returning after a long gap, a 60-minute Swedish is a gentler re-entry than jumping straight to 90 minutes of deep tissue. And across our 7 San Diego locations, mid-morning weekday slots are the quietest — easier to have an unhurried conversation about pressure before you’re on the table.
What actually helps in the 48 hours after
Cleveland Clinic’s guidance for DOMS is refreshingly unglamorous, and it applies here:
- Keep moving gently. A walk, easy stretching, normal daily activity. Sitting completely still tends to make stiffness worse.
- Skip the heavy session. Use the sore muscles normally, just don’t train them hard for a day or two.
- Heat for stiffness, cold for tenderness. Heat gets blood moving and loosens things up; cold dulls the ache. Pick whichever your body prefers — a warm shower is usually the easy answer.
- Drink water like a normal person. Hydration is good for you. It is not draining anything, and chugging a gallon afterward doesn’t shorten the soreness. Ignore anyone who tells you otherwise.
- Wait it out. Rest is the actual treatment. There isn’t a shortcut, and you don’t need one.
When it isn’t normal
Tenderness for a couple of days is expected. These are not:
- Sharp, constant, or localized pain rather than diffuse ache
- Soreness still going strong past a week
- Significant swelling around a muscle
- Numbness, tingling, or weakness
- Unusually dark urine
Any of those, talk to a healthcare provider. We do relaxation and everyday tension, not diagnosis — and a therapist who tells you to push through something in that list is the wrong therapist. If you had a session with us and something felt off, call the studio. We’d rather hear about it.
Muscle soreness after a massage: quick answers
Does soreness mean the massage worked?
No. It means your body met an unfamiliar mechanical load. A session that leaves you loose and not sore at all worked exactly as well. Soreness is not a scorecard.
Should I get another massage while I’m still sore?
Light work is fine, deep work on the same areas isn’t. Give it two or three days, then go again — and mention the soreness when you book so pressure starts lower.
Does drinking water flush out toxins and reduce soreness?
There are no toxins being flushed. Stay hydrated because hydration is generally good, not because it’s doing anything specific to the soreness.
Why was I sore after a light massage but not a deep one?
Usually the gap between sessions, not the pressure. A gentle session after eight months off can produce more tenderness than a firm one three weeks after your last.
Will this stop happening?
For most people, yes. Tissue that gets worked regularly stops reacting to it. The first session back is the one that talks to you the next morning.
Book with the pressure you actually want
If soreness is what’s made you hesitate, come in and say so at check-in — it’s the fastest way to get an hour calibrated to you rather than to an average. Book a session at any of our San Diego studios, or read through the FAQ if this is your first visit. More questions about what’s normal afterward are answered in our piece on whether pain after a massage is normal.
