Massage can absolutely make you feel sick, and it happens more often than most people realize. In a cross-sectional study of 100 massage clients, about 10% reported some form of minor discomfort after their session, with most symptoms appearing within 12 hours and resolving within a day and a half.1PubMed. Side-effects of massage therapy: a cross-sectional study of 100 clients The symptoms people describe range from nausea and headache to fatigue, dizziness, and a general flu-like feeling. These reactions are usually harmless and short-lived, but understanding why they happen can help you avoid an unpleasant surprise after your next appointment.
What Post-Massage Sickness Actually Feels Like
People who feel unwell after a massage tend to describe a cluster of symptoms that overlap with what you might feel at the start of a mild illness. Nausea is one of the most commonly reported complaints, sometimes accompanied by lightheadedness when standing up. Headaches are common, especially after work on the neck and upper back. Some people feel deeply fatigued, almost as if they’ve just finished a hard workout. Others describe muscle soreness that’s more intense than the gentle tenderness they expected.
That same study of 100 clients found that the majority of negative symptoms appeared less than 12 hours after the massage and cleared up within about 36 hours.1PubMed. Side-effects of massage therapy: a cross-sectional study of 100 clients Interestingly, the study also found that 23% of clients experienced unexpected positive side effects that weren’t related to their muscles, things like improved sleep, elevated mood, or a sense of calm that lasted well beyond the session. So the same physiological shakeup that makes some people feel queasy leaves others feeling better than they expected.
Why Your Body Reacts This Way
The simplest explanation for post-massage sickness involves what’s happening at the tissue level. When a therapist applies sustained pressure to your muscles, they’re mechanically compressing fibers, breaking up adhesions, and increasing blood flow to areas that may have been tight or restricted.2PubMed Central. Deep Tissue Massage Therapy: Effects on Muscle Recovery and Performance in Athletes This is essentially a controlled form of soft-tissue stress. Your body responds to that stress the same way it responds to exercise or minor injury: with inflammation.
Research on athletes who received massage after intense sprint exercise found that massage influenced the levels of several inflammatory signaling molecules in the blood. Concentrations of certain inflammatory markers returned to their resting levels faster after massage than without it, suggesting that massage speeds up the resolution of inflammation rather than preventing it entirely.3PubMed Central. Massage Therapy Modulates Inflammatory Mediators Following Sprint Exercise in Healthy Male Athletes A separate study examining muscle biopsies after exercise-induced damage found that massage reduced the production of inflammatory cytokines like TNF-α and IL-6, while also lowering markers of cellular stress in the muscle tissue itself.4PubMed. Massage therapy attenuates inflammatory signaling after exercise-induced muscle damage
Here’s the catch: while massage may help resolve inflammation faster in the long run, the initial inflammatory response still happens. Your immune system detects the tissue manipulation and sends its cleanup crew. That cleanup process involves the same chemical signals your body uses when you’re fighting off an infection. The result is that brief window where you feel achy, tired, and slightly off, essentially a low-grade version of the malaise you get when you’re coming down with something.
The “Toxin Release” Myth
If you’ve ever been told to drink lots of water after a massage “to flush out the toxins,” you’ve encountered one of the most persistent myths in the wellness world. The idea is that massage squeezes stored toxins out of your muscles and into your bloodstream, and that the sick feeling is those toxins circulating before your kidneys filter them out. This claim has almost no scientific support, and the word “toxins” in this context is vague to the point of meaninglessness.
What massage does affect is the metabolic environment of your muscles. Animal research has found that massage decreases levels of lactic acid and blood urea nitrogen in muscle tissue while altering dozens of metabolites involved in energy production pathways like glycolysis and lipid metabolism.5Tissue Cell. Massage therapy modulates energy metabolism and alleviates skeletal muscle spasms in rats But “metabolic waste products” and “toxins” are not the same thing. Lactic acid is a normal byproduct of muscle work that your body clears on its own within an hour or two. And the biopsy study mentioned earlier found that massage had no measurable effect on muscle glycogen or lactate levels, which contradicts the claim that massage flushes metabolic waste out of the tissue.4PubMed. Massage therapy attenuates inflammatory signaling after exercise-induced muscle damage
Staying hydrated after a massage is fine general advice, but it won’t prevent that queasy feeling. The nausea and fatigue come from your nervous system and your immune system responding to the physical stimulus, not from mysterious toxins floating through your blood. If a therapist insists otherwise, that’s a sign they’ve absorbed industry folklore rather than evidence-based training.
Your Nervous System Gets a Jolt Too
The nausea and dizziness people feel after massage aren’t entirely about inflammation. Massage has a measurable effect on your autonomic nervous system, the part of your nervous system that handles things like heart rate, blood pressure, and digestion without you thinking about it. Research on the effects of massage combined with heat application found that cortisol levels dropped significantly within two weeks of regular sessions, and norepinephrine levels (a stress hormone tied to the fight-or-flight response) decreased over the following weeks as well.6Yonsei Medical Journal. The Effects of Heat and Massage Application on Autonomic Nervous System
This shift from sympathetic (fight-or-flight) to parasympathetic (rest-and-digest) dominance is part of why massage feels relaxing. But when the shift is sudden or dramatic, it can leave you feeling lightheaded or nauseated, especially if you sit up quickly after lying face-down for an hour. Your blood pressure drops, your heart rate changes, and your digestive system wakes up. For some people, that transition from the deeply relaxed state on the table back to standing upright is enough to trigger a wave of dizziness or a queasy stomach. It’s a bit like standing up too fast after a long nap, but amplified by the physiological changes that happened during the session.
Immune Changes That Might Surprise You
Beyond the inflammatory response, massage appears to cause genuine shifts in how your immune system behaves, and these shifts differ depending on how often you get massaged. A study comparing the effects of a single Swedish massage session against light touch found that even one session increased the number of several types of circulating immune cells, including natural killer cells and certain T cells.7PubMed Central. A preliminary study of the effects of a single session of Swedish massage on hypothalamic-pituitary-adrenal and immune function in normal individuals
A follow-up study looking at repeated sessions found that the pattern depended on frequency. Weekly massage stimulated a sustained increase in circulating immune cell markers and decreased the production of certain cytokines when immune cells were stimulated in a lab setting. Twice-weekly massage, by contrast, produced a different pattern: it increased levels of oxytocin, decreased cortisol, but had less effect on immune cell numbers and actually led to a slight increase in pro-inflammatory cytokine production.8PubMed Central. A Preliminary Study of the Effects of Repeated Massage on Hypothalamic–Pituitary–Adrenal and Immune Function in Healthy Individuals: A Study of Mechanisms of Action and Dosage
What this means practically is that your body’s immune and hormonal response to massage isn’t static. It changes with dose and frequency. The flu-like feeling after a first massage or an unusually intense session could partly reflect a temporary immune activation that settles down as your body adapts. This also helps explain why people who get massages regularly tend to report fewer of those post-session symptoms over time.
When Deep Tissue Goes Too Deep
Not all massage is created equal when it comes to the risk of feeling awful afterward. Deep tissue massage, sports massage, and any technique that applies strong, sustained pressure into the muscle carries a higher chance of post-session soreness, nausea, and fatigue. The reason is straightforward: more mechanical force means more tissue disruption, which means a bigger inflammatory and nervous-system response.
A systematic review of adverse events associated with massage over an 11-year period identified 40 case reports covering 138 adverse events. The most common serious complications included disc herniation, soft-tissue trauma, nerve damage, and dissection of blood vessels in the neck. The review noted that the overall incidence of these events is low, but that spinal manipulation techniques incorporated into massage have been repeatedly linked to the most serious outcomes.9PubMed Central. Adverse events of massage therapy in pain-related conditions: a systematic review A separate safety review found that the most serious adverse effects were associated mostly with massage techniques other than standard Swedish massage, which uses lighter, flowing strokes rather than deep, focused pressure.10Oxford Academic. The safety of massage therapy
If your goal is relaxation and you’re prone to post-massage nausea, a lighter Swedish-style session is a safer bet than requesting deep tissue work. And if you do opt for deep tissue, communicate clearly with your therapist about pressure. “No pain, no gain” is poor guidance here. Wincing through a session because you think it should hurt is a recipe for feeling terrible the next day.
Rare but Serious Complications
For the vast majority of people, feeling a bit sick after a massage is a passing nuisance. But rare cases illustrate that massage can occasionally trigger or worsen something more serious, particularly when the person has an underlying condition they may not know about.
One published case described a 39-year-old man who developed severe rhabdomyolysis, a condition where damaged muscle fibers leak their contents into the bloodstream, immediately following a two-hour deep tissue massage. He turned out to have an active influenza A infection, and the combination of viral muscle damage and intense mechanical pressure may have worsened the breakdown of muscle tissue enough to threaten kidney function.11PubMed Central. Influenza A-induced rhabdomyolysis with acute renal failure following a deep tissue massage This kind of event is exceedingly uncommon, but it underscores an important point: getting a deep tissue massage while you’re actively fighting an infection is not a good idea. Your muscles are already under stress from the illness, and adding more mechanical trauma on top of that can amplify the damage.
Vascular complications, while rare, are the most alarming. Case reports have documented carotid artery dissection following massage to the neck, with one patient suffering a massive stroke after a chiropractic massage session. Imaging revealed a torn inner wall of the carotid artery and swelling in both vertebral arteries, with no other vascular risk factors to explain the event.12PubMed Central. A near-fatal consequence of chiropractor massage: massive stroke from carotid arterial dissection and bilateral vertebral arterial oedema Another report described vertebral artery dissection after use of a handheld massage gun on the neck, with the authors noting that as these devices become more popular, similar cases may increase.13PubMed Central. Case Report: Vertebral Artery Dissection After Use of Handheld Massage Gun
The neck is the danger zone here. The carotid and vertebral arteries run through a relatively exposed area where aggressive pressure, sudden rotation, or sustained force can damage the vessel wall. This risk applies to handheld percussion devices as much as it does to manual therapy. If you own a massage gun, the front and sides of the neck are off-limits.
Who Is Most Likely to Feel Sick
Certain people are more susceptible to post-massage symptoms. If you rarely get massaged, your body isn’t accustomed to the level of tissue manipulation involved, and you’re more likely to feel the aftereffects. First-timers who jump straight into a 90-minute deep tissue session are the classic candidates for next-day nausea.
People who are dehydrated or haven’t eaten recently tend to fare worse, partly because their blood pressure is already on the lower end and the parasympathetic shift during massage pushes it further down. If you’ve ever felt faint after lying in a hot bath for too long, the mechanism is similar.
Those with a history of trauma may also have a more intense reaction, though not in the way you’d expect. Massage can sometimes trigger emotional releases, especially bodywork techniques that involve sustained, slow-pressure holds. One case report on a client with post-traumatic stress disorder documented episodes where the client had emotional releases during craniosacral and hot-stone treatments, alongside states of deep relaxation she said she couldn’t achieve any other way.14PubMed Central. The Effects of Massage Therapy on Post-traumatic Stress Disorder: A Case Report For some people, this kind of emotional activation can present as nausea, shaking, or a feeling of being unwell. It isn’t dangerous, but it can be disorienting if you’re not prepared for it.
Does Your Therapist’s Training Matter
It matters a lot. The systematic review of massage-related adverse events found that in the case reports examined, only about 6% of the practitioners involved were licensed massage therapists. Roughly a quarter were chiropractors, and the remaining 70% were unregistered practitioners or healthcare professionals applying massage outside their specific training. The authors noted that it would be unfair to judge the safety of massage in general based on complications caused by untrained or forceful practitioners.15PubMed Central. Adverse Events of Massage Therapy in Pain-Related Conditions: A Systematic Review – Section: 4. Discussion
A trained massage therapist learns anatomy, contraindications, and how to read your body’s responses during a session. They know to avoid the anterior neck, to reduce pressure over bony prominences, and to ask about medical conditions before starting. An untrained person applying deep pressure based on a YouTube tutorial doesn’t have that framework. The difference isn’t just about technique; it’s about knowing when not to push harder.
If you consistently feel terrible after massages, it’s worth considering whether the problem is the therapist rather than the massage itself. A skilled practitioner will adjust their approach based on your feedback and your body’s reactions in real time. If your therapist treats every session like a wrestling match regardless of what you say, find a different one.
Practical Ways to Reduce Post-Massage Symptoms
You can minimize the chances of feeling sick by making a few adjustments before and after your session:
- Eat lightly beforehand: An empty stomach combined with the blood-pressure drop during massage is a reliable recipe for nausea. Have a small meal or snack an hour or two before your appointment.
- Start with moderate pressure: If you’re new to massage or returning after a long break, request a medium-pressure Swedish session rather than jumping to deep tissue. You can always go deeper next time.
- Sit up slowly: When the session ends, don’t leap off the table. Sit upright for a minute and let your circulatory system adjust before standing. This alone prevents a lot of the dizziness people report.
- Communicate during the session: If something hurts beyond a “good pain” threshold, say so. Your therapist can’t feel what you feel. The common advice to endure discomfort because it means the massage is “working” is wrong and counterproductive.
- Avoid massage when you’re sick: As the rhabdomyolysis case illustrated, deep tissue work during an active infection can make things worse. If you’re fighting a cold or flu, reschedule.
None of these steps guarantee you won’t feel a little off afterward, especially if you carry a lot of tension and the session involved significant work on tight areas. But they stack the odds in your favor. And if you do feel queasy, rest assured that for the overwhelming majority of people, the symptoms pass within a day or so and don’t signal anything harmful.
Massage Guns and At-Home Devices
The rise of percussion massage guns has introduced a new variable into this conversation. These devices deliver rapid, concentrated bursts of pressure that can reach deep tissue without the nuance of a trained therapist’s hands. They’re popular for post-workout recovery and general soreness, but they carry their own risks.
The case report of vertebral artery dissection from a handheld massage gun is a cautionary example.13PubMed Central. Case Report: Vertebral Artery Dissection After Use of Handheld Massage Gun Unlike a therapist who can feel the tissue responding under their fingers and adjust, a massage gun delivers the same percussive force regardless of what’s happening beneath the surface. On large muscle groups like the quads or glutes, this is generally fine. On the neck, over joints, or near areas with superficial blood vessels and nerves, it can be genuinely dangerous.
If you use a massage gun and notice nausea, dizziness, or unusual fatigue afterward, the most likely culprit is that you overdid it in terms of duration or intensity, or you hit an area that’s more sensitive than you realized. Keeping sessions short, staying on large muscle groups, and avoiding the neck and spine will cut the risk substantially. The device is a blunt instrument compared to a pair of trained hands, and treating it with that awareness makes a real difference.