Are Infrared Saunas Safe? EMF, Heat and Cancer Concerns Addressed

By Telos Wellness Editorial Team. Last reviewed 2026-06-15.

Infrared saunas are not classified as carcinogenic. Non-ionising radiation in the infrared spectrum is not listed by the International Agency for Research on Cancer as a Group 1, 2A or 2B carcinogen, and ICNIRP 2013 guidance treats domestic infrared exposure as below occupational thresholds. The principal documented safety considerations are heat-stroke risk at extended sessions, EMF emissions from heater design, and contraindications including unstable cardiovascular disease, pregnancy without clearance, and recent alcohol intake.

How "safe" is defined in this article

"Safety" is evaluated along three axes in this article: cancer risk attributable to infrared radiation, electromagnetic field exposure inside the cabin, and heat-stress harms together with the contraindications that raise them. Each axis is treated against the published clinical and regulatory literature. Absolute safety statements are avoided in favour of risk descriptions hedged against the evidence. The article addresses safety for a representative healthy adult using a UK-available cabin within published dose guidance. Special populations are treated in a dedicated section.

Cancer — the non-ionising classification explained

Infrared saunas are not classified as carcinogenic. The International Agency for Research on Cancer has not listed infrared radiation as a Group 1, 2A or 2B carcinogen. Infrared occupies the non-ionising portion of the electromagnetic spectrum, distinct from ultraviolet and ionising radiation, and does not damage DNA through the photochemical mechanism by which UV causes skin cancer (ICNIRP, 2013; WHO, 2002) [3][4]. No epidemiological cohort has linked infrared sauna use to elevated cancer incidence.

The IARC framework

The International Agency for Research on Cancer classifies agents into Group 1 (carcinogenic to humans), Group 2A (probably carcinogenic), Group 2B (possibly carcinogenic), Group 3 (not classifiable) and Group 4 (probably not carcinogenic). Solar radiation as a whole is classified Group 1, with the carcinogenic component attributable to the ultraviolet portion. Infrared radiation in the wavelengths used by home saunas (760 nm – 1,000 µm) is non-ionising. IARC has not classified infrared sauna exposure as carcinogenic.

Why ultraviolet and infrared are not equivalent risks

The DNA-damage mechanism by which ultraviolet light produces skin cancer requires photon energies above the ionising threshold; infrared photons sit well below this threshold and deposit thermal energy only (ICNIRP, 2013) [3]. UV-B and UV-C photons carry sufficient energy to break covalent bonds, producing pyrimidine dimers and other DNA lesions. Infrared photons, with much longer wavelengths and lower energy per photon, cannot produce these lesions; absorbed infrared energy is dissipated as heat through molecular vibrational and rotational modes. The two forms of radiation share the name but no biological mechanism.

What the published epidemiology does and does not show

No prospective sauna-cohort study has reported elevated cancer incidence attributable to sauna use. The KIHD cohort in Finland tracks all-cause and cardiovascular mortality over decades of follow-up in traditional-sauna users; its findings on mortality show reduced risk, not elevated, with no signal of increased cancer incidence (Laukkanen et al., 2018). The infrared-cabin format does not have an equivalent prospective cohort of comparable size, but no signal of increased cancer incidence has emerged in the smaller trials and case series summarised by Hussain & Cohen 2018 (Hussain & Cohen, 2018) [1]. The absence of a signal is not proof of absence of risk, but it is the relevant epidemiological state of evidence at this time.

Electromagnetic field (EMF) emissions

Electromagnetic fields are emitted by all mains-powered appliances, infrared saunas included. EMF in an infrared cabin originates from the heater wiring, the controller and the cabin lighting. Well-engineered carbon-panel cabins read 0.1–1.5 mG at the user position; lower-grade units can read 3–10 mG. The Building Biology ALA conservative threshold of <3 mG, often cited in marketing, refers to sleep-environment guidance. Telos test data for the current UK product range read below 1 mG at 4 inches.

Sources of EMF in an infrared cabin

The principal EMF source inside an infrared cabin is the heater wiring, which carries the operating current to each emitter panel. Secondary contributions come from the controller board, which switches the heater circuits, and from the cabin lighting and chromotherapy LEDs where fitted. Well-engineered cabins route the heater wiring to minimise field exposure at the seated user position and incorporate twisted-pair or shielded wiring on long heater runs. Lower-grade units use unshielded parallel wiring close to the seat-back, which is the principal driver of high mG readings at the user position.

The Building Biology ALA threshold (<3 mG)

The Building Biology <3 mG threshold often quoted in infrared-sauna marketing originates from the Standard of Building Biology Testing Methods (SBM) guidance for sleep environments. It is a conservative benchmark drawn from research on long-duration exposure during sleep and is not a regulatory limit for consumer appliances. UK regulators do not set a specific consumer EMF limit for sauna heaters. The 3 mG figure is nevertheless widely used as a comparison benchmark in the consumer market and provides a useful reference point for evaluating cabin EMF disclosure data.

Measured emissions from UK-available cabins (Telos test data)

Gauss-meter readings vary substantially with distance from the emitter; the figures above are quoted at consistent 4-inch and 6-inch distances from the back-bench heater face. Measurements taken further from the user position will record lower values. Buyers asking for EMF disclosure from a retailer should ask for the measurement distance and instrument used, not just a single mG figure.

Heat-stress and heat-stroke risk

Heat-stress and heat-stroke risk is the most material acute safety consideration in routine infrared sauna use. Cardiovascular and pregnancy contraindications interact with heat tolerance, which is why they appear separately below.

Core temperature limits

Core body temperature in an infrared sauna typically rises to 38–38.5°C across a 20–45 minute session at 45–60°C cabin temperature (Hussain & Cohen, 2018) [1]. Sustained core temperatures above 39.5°C are associated with rising heat-stroke risk, with onset signalled by dizziness, nausea, headache, palpitations, confusion and cessation of sweating. Users observing any of these signs should leave the cabin and rehydrate in a cool environment.

Hydration and electrolytes

Sweat loss across a single session is typically 0.3–0.8 L. A practical hydration protocol consists of approximately 500 ml of water before the session, sips during the session if comfortable, and at least 500 ml after the session, with an electrolyte replacement (sodium, potassium, magnesium) following extended or repeated sessions. Pre- and post-session body weight is a practical hydration marker; a weight drop greater than 2% indicates significant fluid deficit requiring full replacement before further exposure.

Session-duration ceiling

The safe exposure ceiling supported by the clinical literature is 45 minutes per session at cabin temperatures of 45–60°C (Hussain & Cohen, 2018) [1]. Sessions beyond this duration are not associated with additional documented benefit and carry rising heat-stroke risk, particularly in unacclimated users and users with impaired thermoregulation. Daily sessions, where used, are reasonably limited to 20–30 minutes per session at the lower end of the cabin temperature range.

Contraindications and special populations

Contraindications recorded in Hussain & Cohen 2018 and Hannuksela & Ellahham 2001 (Hannuksela & Ellahham, 2001) [2] include unstable cardiovascular disease, recent myocardial infarction, severe aortic stenosis, decompensated heart failure, uncontrolled hypertension, pregnancy without clearance, severe anaemia, acute febrile illness, multiple sclerosis flare, photosensitive dermatoses, and intoxication.

Cardiovascular disease

Stable cardiovascular disease is not a categorical exclusion; trials of FIR sauna in chronic heart failure and in hypertensive patients have reported benefit without serious adverse events under medical supervision (Beever, 2009; Hannuksela & Ellahham, 2001) [2]. Unstable cardiovascular disease, recent myocardial infarction (typically within 4 weeks), severe aortic stenosis and decompensated heart failure are explicit contraindications. Users with implanted cardiac devices including pacemakers and ICDs should obtain device-manufacturer guidance before use; magnetic-field interaction at the user position is generally below interference thresholds in shielded cabins but should be confirmed against the device specification.

Pregnancy

Pregnant women are generally advised against infrared sauna use without medical clearance. First-trimester elevation of maternal core temperature above 38.5°C has been associated with raised risk of neural tube defects in the hyperthermia-exposure literature. UK midwifery and obstetric guidance routinely recommends avoidance of saunas, hot tubs and prolonged hot baths throughout pregnancy. Sauna-specific pregnancy trials are not available; the conservative position adopted here aligns with current professional guidance.

Medications and alcohol

Common medications requiring caution before sauna use include diuretics, beta-blockers, anti-hypertensives, sedatives and stimulants (Hannuksela & Ellahham, 2001) [2]. Diuretics interact with sauna-induced fluid loss to increase dehydration risk; beta-blockers blunt the heart-rate response and may alter thermoregulatory perception; anti-hypertensives interact with the peripheral vasodilation of the heat-stress response. Sedatives, narcotics and alcohol impair the user's ability to recognise heat-stress warning signs and are explicit contraindications. Alcohol within the prior 12 hours is a documented risk factor for sauna-related cardiac events in the cohort literature.

Children and adolescents

Children and adolescents have less mature thermoregulation than adults and should not use infrared saunas without adult supervision, shorter session lengths and medical clearance where any cardiac, renal or neurological condition is present. The published clinical sauna literature contains few paediatric trials, and UK consumer guidance defers to parental judgement plus the cabin manufacturer's age restrictions. Sessions for adolescents over 16, if used, are reasonably limited to 15 minutes at lower cabin temperatures.

Is daily use safe?

Daily infrared sauna use is tolerated by most healthy adults at session lengths of 20–30 minutes, but adds little documented benefit beyond 4–5 sessions per week and increases cumulative dehydration and electrolyte-loss risk (Hussain & Cohen, 2018; Laukkanen et al., 2018) [1]. Daily use is contraindicated in pregnancy, decompensated cardiovascular disease and any condition impairing thermoregulation. A buyer planning daily use should aim for shorter individual sessions and monitor hydration, body weight before-and-after, and resting heart rate. Detail on dose-response and the underlying trial data is set out in the article on infrared sauna benefits.

Safety standards the cabin should meet

A UK-sold infrared sauna should meet the following standards and disclosures:

• UKCA or CE marking. Mandatory for consumer electrical appliances placed on the UK market.
• BS 7671:2018+A2:2022. The IET Wiring Regulations govern the electrical installation of the cabin in a UK property.
• Approved Document P. Installation conformity for fixed electrical work in dwellings.
• IEC 60335-2-53. The international safety standard for sauna heating appliances, where applicable to the infrared cabin model.
• EMF test certificate. A manufacturer's declaration of magnetic-field emissions at the seated user position, measured at a stated distance.
• Wood material certificate. Species, grade and durability classification under BS EN 350-2 where relevant for outdoor cabins.

Buyers can request the manufacturer's test certificates before purchase. Reputable UK retailers publish them on the product page or in the product documentation pack. The cabin specification points are addressed in the UK buyers' guide alongside the install requirements, and the physics background appears in the article on how infrared saunas work.

Frequently asked questions

Are infrared saunas safe?

Infrared saunas are considered safe for most healthy adults at standard exposure: 20–45 minutes per session at 45–60°C, 2–4 times per week (S001). Adverse events in monitored cohorts are uncommon and consist principally of mild dehydration, dizziness on standing, and rare cardiac events in users with pre-existing disease (S006). EMF emissions from well-engineered cabins read below 3 mG at the user position. Pregnancy and recent alcohol intake are explicit contraindications without medical clearance.

Do infrared saunas cause cancer?

Infrared saunas have not been linked to cancer in the published epidemiological literature. Non-ionising radiation in the infrared spectrum is not classified as a Group 1, 2A or 2B carcinogen by the International Agency for Research on Cancer (S007, S008). The DNA-damage mechanism by which ultraviolet light produces skin cancer requires photon energies above the ionising threshold; infrared photons sit well below this threshold and deposit thermal energy only, without breaking molecular bonds.

Are there harmful EMFs in infrared saunas?

Infrared saunas emit electromagnetic fields from heater wiring, controllers and lighting at intensities that vary substantially by build quality. Well-engineered carbon-panel cabins typically read 0.1–1.5 mG at the user position; lower-grade units may read 3–10 mG. The widely cited Building Biology ALA threshold of <3 mG is a conservative guideline drawn from sleep-environment standards. UK regulators do not set a specific consumer EMF limit for sauna heaters. Independent measurement is advisable.

Is it bad to use an infrared sauna every day?

Daily infrared sauna use is tolerated by most healthy adults at session lengths of 20–30 minutes, but the trial-replicated dose range is 2–4 sessions per week (S001). Daily use raises cumulative dehydration and electrolyte loss and offers limited additional documented benefit. Daily use is contraindicated in pregnancy, decompensated cardiovascular disease, dysautonomia and any condition affecting thermoregulation. Body weight before and after, resting heart rate and hydration colour are practical monitoring markers.

Can pregnant women use an infrared sauna?

Pregnant women are generally advised against infrared sauna use without medical clearance. First-trimester elevation of maternal core temperature above 38.5°C has been associated with raised risk of neural tube defects in the hyperthermia-exposure literature. UK midwifery and obstetric guidance routinely recommends avoidance of saunas, hot tubs and prolonged hot baths throughout pregnancy. Sauna-specific pregnancy trials are not available; the conservative position adopted here aligns with current professional guidance.

Should children or teenagers use an infrared sauna?

Children and adolescents have less mature thermoregulation than adults and should not use infrared saunas without adult supervision, shorter session lengths and medical clearance where any cardiac, renal or neurological condition is present. The published clinical sauna literature contains few paediatric trials, and UK consumer guidance defers to parental judgement plus the cabin manufacturer's age restrictions. Sessions for adolescents over 16, if used, are reasonably limited to 15 minutes at lower cabin temperatures.

What medical conditions are contraindications for infrared sauna use?

Contraindications recorded in Hussain & Cohen 2018 and Hannuksela & Ellahham 2001 (S001, S006) include unstable cardiovascular disease, recent myocardial infarction, severe aortic stenosis, decompensated heart failure, uncontrolled hypertension, pregnancy without clearance, severe anaemia, acute febrile illness, multiple sclerosis flare, photosensitive dermatoses, and intoxication. Common medications requiring caution include diuretics, beta-blockers, anti-hypertensives, sedatives, and stimulants. Users with implanted medical devices should obtain device-manufacturer guidance before use.

Can infrared sauna use cause heat stroke?

Heat stroke is possible at infrared sauna sessions exceeding 45 minutes, particularly without adequate hydration or in users with impaired thermoregulation. Onset is signalled by dizziness, nausea, headache, confusion and cessation of sweating. The safe exposure ceiling supported by the clinical literature is 45 minutes per session at cabin temperatures of 45–60°C (S001). Pre-session hydration of approximately 500 ml water, post-session rehydration and an electrolyte replacement after extended sessions reduce risk.

How does infrared sauna safety compare to a traditional Finnish sauna?

Infrared and traditional Finnish saunas have broadly comparable safety profiles. Traditional saunas operate at higher air temperatures (80–100°C) and pose greater heat-stroke risk at equivalent session length, particularly during löyly steam pulses; infrared cabins at 45–60°C reduce that risk margin. Cardiovascular contraindications apply equally to both. EMF exposure differs by source: traditional saunas have negligible EMF from resistive heaters; infrared cabins emit measurable fields from carbon-panel wiring (S007).

What safety certifications should an infrared sauna have?

A UK-sold infrared sauna should carry UKCA or CE marking, electrical compliance under BS 7671:2018+A2:2022 (S017), installation conformity with Approved Document P (S016), and ideally manufacturer certification to IEC 60335-2-53 where applicable. Heater materials should carry a declaration of EMF testing and emission figures. Wood materials should be certified to a recognised durability standard. Buyers can request the manufacturer's test certificates before purchase; reputable UK retailers publish them on the product page.

References

1. Hussain J, Cohen M. Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review. Evidence-Based Complementary and Alternative Medicine, 2018. DOI: 10.1155/2018/1857413.
2. Hannuksela ML, Ellahham S. Benefits and risks of sauna bathing. American Journal of Medicine, 2001; 110(2): 118–126.
3. International Commission on Non-Ionizing Radiation Protection (ICNIRP). Guidelines on Limits of Exposure to Incoherent Visible and Infrared Radiation. Health Physics, 2013; 105(1): 74–96.
4. World Health Organization. Environmental Health Criteria 232: Static Fields. WHO, 2002.
5. Institution of Engineering and Technology. BS 7671:2018+A2:2022 Requirements for Electrical Installations (IET Wiring Regulations). IET, 2022.
6. HM Government. Approved Document P — Electrical Safety: Dwellings. Building Regulations, 2013 ed.