Breathing is the one part of the autonomic nervous system you can steer on purpose, which is why so many traditions and modern programs build practices around it. Breathwork now covers everything from a few slow breaths before a meeting to hours-long sessions of deep, fast breathing with music. These are not the same thing, and they don't carry the same evidence or the same risks. Here is how slow and fast breathwork differ, what trials show for stress and inflammation, and the safety rules that matter most, including one that has cost lives.
Slow breathing, usually under 10 breaths a minute, tends to shift the body toward rest. A 2018 review in Frontiers in Human Neuroscience found slow breathing raised heart rate variability (HRV), pointing to strong involvement of the parasympathetic, rest-and-digest side of the nervous system, though the studies varied in method. A 2022 review of 223 studies in Neuroscience and Biobehavioral Reviews found vagally mediated HRV rose during slow breathing, right after a session, and after multi-session programs.
Fast, deep breathing, the core of the Wim Hof method and holotropic breathwork, works the other way. Breathing more than the body needs blows off carbon dioxide. MedlinePlus explains that excessive breathing creates a low level of carbon dioxide in the blood, which can cause lightheadedness, dizziness, a pounding heartbeat, numbness or tingling around the mouth and in the arms, and muscle spasms in the hands and feet. These sensations are signs of a real change in blood chemistry.
A 2023 meta-analysis in Scientific Reports pooled randomized trials of breathwork for mental health. Across 12 trials with 785 adults, breathwork lowered self-reported stress by a small to moderate amount compared with control conditions, with similar small to moderate effects for anxiety and depression. No stress trial was at low risk of bias, and slow and fast styles did not differ significantly. NCCIH's summary of relaxation techniques is more cautious still: breathing exercises may help reduce stress, but that evidence is preliminary, and slow breathing modestly lowered blood pressure in one review whose studies had short follow-up and a high risk of bias.
One of the more practical studies compared short daily practices. In a 2023 trial in Cell Reports Medicine, 108 people did 5 minutes a day for a month of mindfulness meditation or one of three breathing patterns:
Cyclic sighing was the only practice that improved positive mood more than mindfulness. None beat mindfulness on anxiety, and the authors called the study exploratory. Evidence: small to moderate, from trials with real risk of bias, that breathwork can ease everyday stress. Slow breathing is free, and low risk when done seated.
The Wim Hof method combines fast breathing rounds and breath holds, cold exposure and focused meditation. Its best-known study, published in PNAS in 2014, trained a group of healthy men for 10 days, then compared 12 of them with 12 untrained men. All 24 were given an injection of a bacterial toxin that briefly causes flu-like illness. The trained group had fewer flu-like symptoms, more of the anti-inflammatory signal IL-10 (194% higher) and less of several inflammatory signals, including TNF-alpha (53% lower) and IL-6 (57% lower), with higher adrenaline.
That is a striking result, and it showed that the stress response can be influenced on purpose. It was also one small study in healthy men. A 2024 systematic review in PLOS ONE gathered 8 trials of the method and could not pool them because they were so different. It found two toxin-challenge trials, the 2014 study and a 2022 Dutch trial, with similar results, plus one small trial in people with axial spondyloarthritis. It also found that 86% of participants were men and that the quality of the studies is very low. Evidence: early and promising for stress physiology; not proven to manage any disease. If you have an inflammatory or autoimmune condition, it can sit alongside your care plan, not replace it.
This is the rule that matters most. Fast breathing or breath-holding before swimming lowers the body's carbon dioxide stores, which delays the brain's signal to come up for air. Oxygen keeps falling until the swimmer loses consciousness underwater. In water, that blackout can be fatal.
The CDC documented 16 cases in New York State from 1988 to 2011 in which people did dangerous underwater breath-holding, including intentional hyperventilation, and 4 died. All four who died were experienced swimmers aged 17 to 22. The CDC's drowning prevention advice is direct: do not hyperventilate before swimming underwater or try to hold your breath underwater for long periods, because it can make you pass out and drown.
Christina and Stanislav Grof developed holotropic breathwork in 1975. A session usually lasts 1 to 3 hours of deep, fast breathing supported by music and optional bodywork, often in a group where a trained facilitator oversees and a partner, called a sitter, watches over each breather. The aim is an altered state of consciousness. Cleveland Clinic notes the most common experience is emotional release, and that it is best used alongside ongoing therapy so whatever surfaces can be worked through.
The physical change is large. In a 2025 study in Communications Psychology of holotropic and conscious-connected breathwork sessions, exhaled carbon dioxide fell as low as 10 to 20 mmHg, a level the authors note would be considered a sign of a severe physiological problem in other settings. A 2024 trial in Scientific Reports of 200 people doing brief high-ventilation breathwork with breath holds found about 9% of participants had unpleasant short-term effects, such as tingling with temporary inability to use the fingers (tetany), at a similar rate to a placebo breathing group, and none reported lasting effects.
Facilitators of holotropic breathwork themselves screen people out. A 2015 study in the Journal of Alternative and Complementary Medicine lists the contraindications they specify, and Cleveland Clinic gives a similar list:
NCCIH also notes rare reports that relaxation techniques might cause or worsen symptoms in people with epilepsy or certain psychiatric conditions. Evidence: limited, mostly small and uncontrolled studies. If you choose it, choose a trained facilitator who screens every participant.
Questions to bring to a clinician or facilitator:
Chest pain, fainting, a seizure or trouble breathing during practice needs 911. With a free Gabriel account, you can ask Gabriel anything about a practice and your health history before you try it.
Breathwork is not one thing. Slow breathing, box breathing and cyclic sighing are free, low-risk ways to calm the nervous system, with modest evidence for stress. The Wim Hof method showed in one small study that trained men could temper their inflammatory response, but the wider evidence is very low quality, and fast breathing plus breath holds near water can be deadly. Holotropic breathwork can be a meaningful experience for some people, with real physical effects and a long list of reasons to sit it out. Pick the practice that fits your goal and your health, and make the decision with a licensed clinician if anything on the screening list applies. Your call.
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