Most writing about breathwork assumes everyone should do it. That is not true, and the distinction matters more than most people realise: the techniques with the strongest safety record and the techniques with documented fatalities are often taught side by side, in the same class, to the same beginner.

This article separates them. It covers who should avoid specific breathing practices, which techniques carry real risk, and which stay appropriate for almost everyone.

This is general education, not medical advice. If you have a diagnosed cardiovascular, respiratory, neurological, or psychiatric condition, or you are pregnant, talk to your clinician before starting any structured breathing practice.

The Single Most Important Rule

Never practise any breath-holding or rapid-breathing technique in or near water, and never while driving.

This is not a cautious disclaimer. Hyperventilation followed by breath-holding suppresses the urge to breathe without increasing available oxygen, which means a swimmer can lose consciousness with no warning sensation beforehand. Shallow water blackout has killed experienced, fit swimmers, including people who believed the technique made them safer. No breathing practice is worth performing in water.

Two Categories of Risk

Breathing techniques are not one category with one risk profile. They split cleanly into two groups.

Slow, low-intensity breathing means diaphragmatic breathing, coherent breathing at roughly five to six breaths per minute, extended-exhale patterns, and the physiological sigh. These reduce breathing rate, raise heart rate variability, and carry minimal risk for the general population. Most of the clinical evidence for breathwork comes from this group.

High-intensity breathing means anything that deliberately drives breathing rate up or holds the breath for extended periods: the Wim Hof method, Kapalabhati, Bhastrika, holotropic and rebirthing styles, and long retention practices. These produce large, fast shifts in blood chemistry. That is the point of them, and it is also the source of their risk.

Almost every documented adverse event in breathwork comes from the second group. When general advice says breathing exercises are safe, it is usually describing the first.

Who Should Avoid Hyperventilation-Based Breathwork

Rapid or forceful breathing lowers carbon dioxide sharply, which constricts cerebral blood vessels and shifts blood pH. Avoid these techniques, or practise only under clinical supervision, if any of the following apply.

Epilepsy or any seizure history. Hyperventilation is used deliberately in EEG testing to provoke seizure activity. This is a clear contraindication.
Cardiovascular disease, arrhythmia, or uncontrolled high blood pressure. Forceful breathing and straining change intrathoracic pressure and cardiac load.
Pregnancy. Rapid breathing, forceful abdominal engagement, and long retentions are generally advised against. Slow breathing is usually fine, but confirm with your obstetric provider.
Glaucoma, recent eye surgery, or retinal detachment risk. Straining raises intraocular pressure.
Recent surgery, hernia, or acute abdominal conditions. Forceful abdominal breathing is mechanically stressful.
Panic disorder. Hyperventilation reproduces the exact physiology of a panic attack, tingling, dizziness, chest tightness, and can trigger one. Slow breathing with a longer exhale is the appropriate practice here instead.
Uncontrolled asthma or acute respiratory illness. Forced rapid breathing can provoke bronchoconstriction.

Who Should Avoid Extended Breath Retention

Holding the breath, whether after an inhale or an exhale, raises carbon dioxide and can raise blood pressure. The list overlaps with the one above and adds a few.

Uncontrolled hypertension, since retention transiently raises blood pressure further
Coronary artery disease or a history of stroke
Pregnancy, for anything beyond brief, comfortable pauses
Children, who should not be taught long retentions
Anyone practising alone in water, without exception

What Stays Appropriate for Almost Everyone

If you have a condition on the lists above, you are not excluded from breathwork. You are excluded from a specific subset of it. The following remain suitable for most people, including many who cannot do intense practices.

Technique	Pattern	Notes
Diaphragmatic breathing	Relaxed belly breathing, normal rate	The safest starting point; no pressure changes
Coherent breathing	About 5 to 6 breaths per minute	Largest heart rate variability response with minimal risk
Extended exhale	Inhale 4, exhale 6	Parasympathetic activation without retention
Physiological sigh	Double inhale, long exhale	Fast acute relief; no sustained hyperventilation

Note that box breathing, often recommended as the beginner default, includes two holds. They are short, and for healthy adults that is fine. For someone with uncontrolled hypertension, an extended-exhale pattern without holds is the better choice.

Warning Signs That Mean Stop

Mild tingling in the hands or lips during fast-breathing practice is a normal consequence of lowered carbon dioxide and resolves within a minute of returning to normal breathing. The following are not normal. Stop, breathe normally, and sit or lie down.

Dizziness that does not resolve quickly, or any loss of vision
Muscle cramping or spasm in the hands, feet, or face
Chest pain or pressure
Heart palpitations or an irregular pulse
Rising panic, dissociation, or a feeling of unreality
Headache during or immediately after practice

Chest pain, fainting, or an irregular heartbeat during breathing practice warrants medical attention rather than a second attempt.

How to Practise Safely

Four rules cover most of the risk. Practise seated or lying down, never in water. Start with slow techniques and stay there for several weeks before considering anything intense. Never push through a warning sign, since the physiology does not reward persistence here. And treat instructor enthusiasm as a poor substitute for a clinician who knows your history.

Real-time feedback helps for a reason that is easy to miss: it removes the incentive to go harder. When you can see your own heart rate variability respond, it becomes obvious that slow, unforced breathing produces the larger physiological shift. Intensity feels like effort. The measurement shows it is usually not the thing producing the result.

The techniques with the best safety record are also the ones with the strongest evidence. That is a convenient overlap, and it is not a coincidence.

Key Points

Never practise breath-holding or rapid breathing in or near water, or while driving.
Hyperventilation-based techniques are contraindicated with epilepsy, cardiovascular disease, pregnancy, glaucoma, panic disorder, and uncontrolled asthma.
Extended retention adds contraindications for hypertension, coronary disease, and stroke history.
Slow diaphragmatic, coherent, and extended-exhale breathing remain appropriate for most people and carry most of the clinical evidence.
Cramping, chest pain, palpitations, unresolving dizziness, or rising panic mean stop, not push harder.

If you are unsure which category you fall into, start with slow breathing at about six breaths per minute and raise the question with your clinician before going further.

Breathwork Contraindications: Who Should Not Do Breathing Exercises