Effects
- Short-term reduction in anxiety and improvement in mood and wellbeing (best supported)
- Short-term reduction in pain compared with no treatment
- Reduced delayed-onset muscle soreness (DOMS) after hard exercise
- Small, short-lived gains in flexibility
- No good evidence that massage flushes toxins, removes lactic acid, boosts deep circulation or physically breaks down adhesions
This note summarises the evidence behind the other physiology notes. Use it to decide what you can honestly say to clients.
How to read massage research
- Many trials are small and cannot blind participants (people know they had a massage), which inflates effects.
- Comparisons matter. Massage looks best against no treatment, and much less impressive against sham or other active treatments.
- Most measured benefits are short term, lasting hours to a few weeks.
- A review’s quality rating (for example “low certainty”) tells you how much the answer might change with better studies.
What the evidence supports
| Claim | Strength | Notes |
|---|---|---|
| Less anxiety, better mood and wellbeing | Moderate | The most consistent finding. Single sessions reduce state anxiety; a course of sessions reduces trait anxiety and depressive symptoms. One meta-analysis found no single-session change in “negative mood”. See Psychological effects of massage |
| Lower heart rate and blood pressure in the short term | Limited | See Relaxation and the parasympathetic response |
| Short-term pain relief | Limited | Better than no treatment; small benefit over other treatments; low certainty. See Pain, the pain gate and the nervous system |
| Less muscle soreness (DOMS) after hard exercise | Moderate | Several meta-analyses agree; no effect on strength, speed or endurance |
| Small, short-lived flexibility gains | Limited | See Muscle tone and flexibility |
A 2019 evidence map of 49 systematic reviews found high-quality reviews concluded there was low-strength evidence of benefit for many kinds of pain. A 2015 review found massage helped some musculoskeletal pain compared with no treatment, but showed no clear benefit over other active treatments.
What the evidence does not support
“Massage flushes out toxins.” This is the claim to retire first.
- The body removes waste products through the liver, kidneys, lungs and gut. There is no identified “toxin” that massage releases or removes, and no study has measured one being flushed out.
- “Detox” claims in general lack clinical evidence, even for the diets and products built around them.
- Advice to “drink lots of water to flush out the toxins released by the massage” has no evidence behind it. Offering water after a session is fine as a kindness, not a treatment.
- Feeling tired, sore or light-headed after a massage is not “toxins leaving the body.” It is more likely due to pressure that was too deep, lying still for a long time, or deep relaxation.
“Massage removes lactic acid.” Lactate levels fall on their own after exercise, and lactate is not what causes next-day soreness. In a direct test, massage actually slowed lactate removal compared with resting. Lactate also does not cause next-day soreness.
“Massage boosts circulation.” It warms and reddens the skin, but controlled studies have not shown increased blood flow to the muscles. See Circulation and blood flow.
“Massage breaks down adhesions or lengthens fascia.” Hands cannot generate the forces needed to deform dense fascia, and massage does not acutely change muscle or tendon stiffness. See Fascia.
“Massage works by lowering cortisol.” The measured effect on cortisol is very small and usually not different from zero.
“Massage boosts the immune system or drains the lymph.” Not established for relaxation massage in healthy people. See The lymphatic system and massage.
Safety
Massage is generally low-risk when done by trained therapists. In the Cochrane low-back pain review, no serious adverse events were reported; a temporary increase in pain was the most common side effect.
What you can honestly say
- “Most people find massage relaxing, and research shows it can reduce anxiety and help people feel better.”
- “It can ease aches and pains for a while.”
- “After hard exercise, massage can reduce how sore you feel.”
Avoid promising to fix, treat, detox or cure anything.