Sources & Methodology

This article draws on published peer-reviewed research, WHO environmental health guidance, and clinical safety literature. GreatHealthGear does not conduct clinical research; all specific findings cited are from published sources.

This article does not constitute medical advice. Always consult a qualified healthcare professional before starting sauna use if you have any health conditions, take regular medications, or are in a health situation not covered by the general guidance in this article.

Is Infrared Sauna Safe? The Direct Answer

For healthy adults without contraindications, using an infrared sauna within recommended temperature and duration parameters is safe. The risks are real but manageable, and they are primarily driven by:

  1. Dehydration from sweat loss
  2. Cardiovascular demands (elevated heart rate and vasodilation)
  3. EMF exposure from the heating elements
  4. Heat exposure for specific at-risk populations

Each of these is addressed below with reference to the published evidence.

EMF Safety: The Evidence and the Marketing

The EMF question is where the most marketing noise exists in the infrared sauna category. Almost every infrared sauna claims “low EMF.” Understanding what this means requires separating scientific evidence from marketing.

What the science says

Extremely low frequency electromagnetic fields (ELF-EMF) are produced by all household electrical appliances — ovens, microwaves, electric blankets, and infrared heaters all produce measurable ELF-EMF. The World Health Organization’s Environmental Health Criteria Monograph on ELF-EMF (2007) — one of the most comprehensive reviews of the evidence — concluded that there is no established causal mechanism for ELF-EMF at household-appliance levels causing cancer or other health outcomes.

The International Agency for Research on Cancer (IARC) classifies ELF-EMF as Group 2B — “possibly carcinogenic to humans.” This classification is based on limited epidemiological associations and does not indicate an established causal risk. Group 2B is the same classification applied to coffee and pickled vegetables.

The WHO's position (Environmental Health Criteria 238, 2007) is that there is no established causal relationship between ELF-EMF exposure at levels encountered in everyday life — including from electrical appliances — and adverse health outcomes. This position reflects the scientific consensus of the major health bodies globally.

What “low-EMF” means for sauna products

Carbon panel heaters produce lower EMF than older ceramic rod heaters because they operate at lower surface temperatures. This is a real technological difference. Brands like Clearlight and Sunlighten publish specific milligauss measurements from third-party testing; budget brands typically make the claim without supporting data.

The practical implication: if EMF is a concern, choose brands that publish independent test data. But frame this as a preference for transparency, not as a response to an established health risk — because an established health risk at these levels has not been identified by the evidence.

Cardiovascular Safety

Infrared sauna sessions place real cardiovascular demands on the body. During a session:

  • Heart rate typically increases to 100–150 BPM, comparable to moderate-intensity exercise
  • Peripheral vascular resistance decreases as blood vessels vasodilate
  • Blood pressure changes — typically falls moderately during a session

For healthy adults, these responses are benign and may actually represent beneficial cardiovascular conditioning over time (the mechanism proposed for traditional sauna’s cardiovascular benefits).

Higher-risk populations

Hypertension: Moderate infrared sauna use may actually help reduce blood pressure — small studies report this effect. However, the acute cardiovascular stress of a session is real, and people with uncontrolled hypertension should consult their doctor before starting.

Heart failure: Japanese clinical work (Waon therapy with far infrared) has studied sauna use in heart failure patients under medical supervision, with some positive results. This is not an indication that heart failure patients can self-prescribe sauna use — it requires cardiac supervision.

Post-heart attack: Standard guidance is to avoid sauna use for several months after a cardiac event. Timing and parameters require specific cardiological guidance.

Arrhythmias: Heat stress can be a trigger for arrhythmias in susceptible individuals. Anyone with a known arrhythmia should seek explicit cardiac clearance before any sauna use.

Contraindications — When Not to Use

The following are standard contraindications for infrared (and traditional) sauna use:

Absolute contraindications (do not use without medical clearance):

  • Pregnancy — core temperature elevation is a teratogenic risk
  • Cardiac pacemaker or implanted cardioverter-defibrillator (ICD) — electromagnetic interference and heat exposure
  • Active fever or acute infection — heat stress on an already-stressed system
  • Severe cardiovascular disease (unstable angina, recent MI, decompensated heart failure)
  • Acute inflammatory conditions or open wounds

Relative contraindications (consult a doctor):

  • Controlled cardiovascular disease (hypertension, stable angina)
  • Diabetes — impaired sweating and thermoregulation in some patients
  • Multiple sclerosis — heat can transiently worsen symptoms (Uhthoff’s phenomenon)
  • Kidney disease — impaired fluid regulation
  • Medications affecting thermoregulation or blood pressure (diuretics, beta-blockers, certain antidepressants)
If you have any of the relative contraindications listed above, consult your doctor before using a sauna. This is not a formality — the cardiovascular demands of a sauna session are equivalent to moderate-intensity exercise, and the same precautions apply.

Heat exhaustion and heat stroke

The most significant acute safety risk from sauna use is heat-related illness:

Heat exhaustion: Heavy sweating, weakness, dizziness, nausea, and cool pale skin. Treatable by immediately cooling down and rehydrating.

Heat stroke: Core body temperature above 40°C (104°F), confusion, loss of consciousness, cessation of sweating. A medical emergency.

Heat stroke from infrared sauna use is rare in healthy adults at normal session durations, but it can occur in conditions of inadequate hydration, excessively long sessions, or in individuals with impaired thermoregulation.

Prevention:

  • Drink 500ml water before every session
  • Do not exceed recommended session duration (45 minutes maximum for infrared)
  • Exit immediately if you feel dizzy, confused, or stop sweating
  • Never use a sauna when dehydrated or immediately after alcohol

Fainting risk

Standing up rapidly after a sauna session can cause orthostatic hypotension — a brief drop in blood pressure that can cause fainting. This is more common in older adults and in people who have had long sessions. Exit saunas slowly, remain seated for a minute before standing, and have something to hold onto.

Safety Tips for Everyday Use

  1. Always hydrate before, during, and after. 500ml before, water available during, 500–1,000ml after.
  2. Start with shorter sessions. 15–20 minutes when new to sauna use; build up gradually.
  3. Do not use with alcohol. Alcohol impairs thermoregulation and accelerates dehydration.
  4. Do not fall asleep. Particularly relevant in sauna blankets with auto-shutoff — do not rely on the timer to wake you.
  5. Keep an exit route accessible. In blanket-format products, ensure you can open the zipper from inside.
  6. Do not use during illness. Any fever or infection adds thermal burden the body cannot manage safely.
  7. Listen to your body. Dizziness, nausea, or unusual symptoms are signals to exit — not push through.

Product Safety Considerations

When buying an infrared sauna, safety factors worth verifying:

  • Auto-shutoff timer: All credible products should have this. Verify it is present.
  • Electrical safety certification: ETL (North America) or CE (Europe) confirms independent verification of electrical safety standards
  • Temperature range: Products with a maximum of 65°C / 150°F for far infrared are appropriate; products claiming much higher are unusual and worth scrutinising
  • EMF data: Prefer brands that publish third-party measurements over those that make the claim without supporting data

The Bottom Line

Infrared saunas are safe for most healthy adults when used as directed. The EMF concern is not supported by the current scientific consensus as an established health risk. The cardiovascular demands are real and require medical clearance for at-risk populations. Dehydration is the most common practical risk and is entirely preventable.

Use the standard contraindications list honestly — if you have any of the listed conditions, consult your doctor before starting. If you are healthy, without contraindications, and you maintain proper hydration, infrared sauna sessions are a low-risk wellness practice with a plausible (if limited) evidence base for benefit.

For product recommendations, see Best Infrared Saunas. For guidance on how often to use, see How Often Should You Use a Home Sauna?. For the evidence on what infrared saunas may do for you, see Infrared Sauna Health Benefits.