Is an Infrared Sauna Safe? What the Research Shows

What Is an Infrared Sauna?

An infrared sauna is a type of sauna that uses infrared light to generate heat. Unlike traditional Finnish saunas that warm the air around you, infrared saunas employ specialized lamps or panels to emit infrared rays absorbed directly by the skin without significantly heating the ambient air. This method was originally developed in the 1960s by Japanese physician Dr. Tadashi Ishikawa as part of a movement to explore light-based therapies for healing and relaxation [1]. Since then, infrared saunas have evolved through four main generations: far-infrared, near-infrared, full-spectrum, and low-EMF models.

The technology centers on electromagnetic radiation within the infrared spectrum, which is divided into near-, mid-, and far-infrared wavelengths. Far-infrared waves, the most common in consumer saunas, penetrate up to 1.5 inches into the body, raising core temperature gradually. Near-infrared waves penetrate deeper, often used in clinical settings for wound healing and detoxification. This targeted heating means you sweat profusely at a fraction of the temperature of a traditional sauna-typically between 120°F and 140°F versus 150°F to 195°F-which many users find more tolerable.

How Does an Infrared Sauna Work?

Infrared saunas operate by emitting photons that the body perceives as radiant heat, directly stimulating thermal receptors in the skin and deeper tissues. This process, known as photobiomodulation, triggers a cascade of physiological responses: blood vessels dilate, circulation improves, and the body begins to perspire to regulate temperature. Because the heat is not reliant on hot air, the experience feels less oppressive, allowing longer sessions with less cardiovascular strain [2]. The heat bypasses the skin’s surface to warm muscles and joints, which is why athletes often use infrared saunas for post-workout recovery.

From a safety perspective, the lower ambient temperature is a significant advantage. There is no steam or humidity, which means less risk of scalding from hot surfaces and a reduced likelihood of heat-induced dizziness. The dry nature of the heat also makes it suitable for people with respiratory issues like asthma who may find steam difficult to breathe. However, because sweating occurs at lower temperatures, users sometimes overlook the need for hydration, which remains essential. As with any form of heat exposure, the body’s core temperature can still rise, so individual responses must be monitored [3].

Is Infrared Sauna Safe? The Research Evidence

The safety of infrared saunas has been a subject of clinical investigation for over 20 years, with a clear consensus emerging: when used as directed, infrared sauna therapy poses minimal risk. A 2009 systematic review published in Canadian Family Physician analyzed multiple studies and concluded that infrared sauna use appears safe, with adverse events limited to mild symptoms like lightheadedness or muscle cramps, all resolving spontaneously [4]. Another landmark 2015 study in Mayo Clinic Proceedings explored sauna bathing and cardiovascular outcomes, noting that while the research focused primarily on traditional saunas, the findings are largely transferable given infrared’s even milder hemodynamic demands [5].

One area of scrutiny has been electromagnetic field (EMF) emissions from infrared panels. Early models sometimes produced high EMF levels, prompting concerns about cellular damage. However, modern saunas are engineered with low-EMF or zero-EMF technology, often certified by independent testing labs. A 2018 study in Bioelectromagnetics measured EMF levels in multiple commercial infrared saunas and found that newer units produced emissions well within internationally accepted safety guidelines, similar to household appliances [6]. Researchers consistently recommend choosing certified low-EMF models to mitigate any theoretical risk.

Long-term safety data is robust. Epidemiological studies in Finland, where sauna use is nearly universal, demonstrate that regular sauna bathing-predominantly traditional but increasingly infrared-is associated with reduced all-cause mortality and no increase in adverse events over decades [7]. While infrared-specific longitudinal studies are fewer, the physiological pathways are comparable, and body of evidence supports its integration into a healthy lifestyle. The key safety principle remains moderation: sessions of 15-30 minutes at moderate temperatures, with adequate hydration, have not produced serious complications in any controlled trial.

What Are the Potential Risks of Infrared Saunas?

Despite their strong safety profile, infrared saunas are not entirely risk-free. The most common pitfalls are dehydration and electrolyte imbalance, as a single session can induce sweat loss of up to 1-2 liters. If fluids aren’t replenished, symptoms can escalate from mild dizziness to heat exhaustion. Additionally, individuals taking medications that affect sweating-such as anticholinergics or beta-blockers-may have impaired thermoregulation, increasing their vulnerability [8].

Although rare, contact burns can occur if the skin touches a heating panel for an extended period. Manufacturers typically shield panels with protective grills, but users should still maintain a safe distance. Ocular safety has also been debated: near-infrared light can theoretically contribute to cataract formation if exposure is chronic and unprotected, though this risk is minimal with typical home use and can be eliminated entirely by wearing protective goggles or simply closing your eyes [9].

Another consideration is syncope, or fainting, due to the vasodilation effect. As blood vessels widen to release heat, blood pressure drops, which can cause lightheadedness when standing up too quickly after a session. This is easily prevented by cooling down gradually and rising slowly. For most individuals, these risks are hypothetical and comfortably managed through basic precautions.

Who Should Avoid Infrared Saunas?

Certain populations should exercise special caution or avoid infrared saunas altogether. Pregnant women are at the top of this list because hyperthermia during the first trimester has been linked to neural tube defects. The relative coolness of an infrared sauna compared to traditional ones does not eliminate the risk, as core temperature can still rise, so medical guidance universally advises against sauna use during pregnancy [10].

Individuals with poorly controlled hypertension, recent myocardial infarction, or severe aortic stenosis should consult a cardiologist before stepping into any sauna. The heat-induced drop in blood pressure may be too unpredictable for compromised cardiovascular systems. Similarly, people with multiple sclerosis or lupus often experience symptom flare-ups from heat, a phenomenon known as Uhthoff’s phenomenon, making infrared saunas potentially counterproductive. Those with metal implants-joint replacements, plates, or screws-are generally safe, but localized heating can cause discomfort, so they should check with their surgeon first [11].

Children have a larger body surface area relative to their mass and mature sweating mechanisms, making them more susceptible to overheating. While no specific pediatric research exists, most sauna manufacturers set an age minimum of 12-16 years. Anyone with an active infection, fever, or alcohol intoxication should absolutely postpone a session until fully recovered.

Infrared Sauna Safety Tips

To maximize safety and enjoyment, adopt a few straightforward habits. Hydration is paramount: drink at least 16 ounces of water before entering, and take additional sips during your session if using a water-safe container. Set a timer for your first few sessions to avoid accidentally exceeding 20 minutes, and never use a sauna alone if you have a history of fainting. Laying a clean towel on the bench absorbs sweat and creates a non-slip surface.

Personal gear can also make a difference. A quality sauna hat, like The Classic Merino Wool Sauna Hat, acts as an insulator for the top of your head-the body part most sensitive to heat-allowing you to remain in the sauna longer with less discomfort. Similarly, wearing lightweight, breathable clothing or simply a towel is recommended; avoid synthetic fibers that can melt or trap heat. For detailed dress-code advice, see our guide on what to wear in a sauna [12].

After your session, cool down gradually. Step out and sit in a room-temperature environment for at least five minutes before showering. A lukewarm rinse-never cold-prevents a sudden vascular shock. Replenish electrolytes with a light snack or mineral water, and note how you feel; if any symptom like headache or nausea persists, reduce duration next time.

Infrared Sauna vs. Traditional Sauna: Safety Comparison

While both sauna types are generally safe, their distinct heating mechanisms create different risk profiles. The following table highlights key differences to help you choose the best option for your health needs.

A 2021 review in Complementary Therapies in Medicine by Hussain et al. directly compared safety outcomes and noted that while both modalities are well-tolerated, infrared sauna users reported fewer instances of respiratory discomfort and perceived heat stress, likely attributable to the cooler, drier environment [13].

Can You Use an Infrared Sauna After a Workout?

Yes, and it may actually accelerate recovery. The gentle heat helps relax tight muscles and promotes blood flow to clear metabolic waste like lactic acid. Because the temperature is lower, you’re less likely to feel overwhelmed after an already intense exercise session. For a complete breakdown of post-exercise sauna protocols, read our guide on how long to sit in a sauna after a workout. The key is to rehydrate first and limit the session to 20 minutes or less if you’re new to combining the two.

Is a Sauna Good for a Cold? What About Infrared?

Traditional wisdom often claims that saunas can “sweat out” a cold, but the evidence is mixed. While the elevated temperature may temporarily mimic a fever and stimulate immune response, infrared sauna’s mild warmth could be less taxing when you’re unwell. That said, if you have a fever or body aches, rest is more beneficial. See our in-depth article is a sauna good for a cold for a nuanced look at the research.

How Often Should You Sauna for Safety and Benefits?

Consistency is more important than intensity. Most studies reporting health benefits involved 3-4 sessions per week, with infrared allowing for potentially more frequent use due to lower thermal load. Beginners should start with 2-3 sessions per week and monitor how their body adapts. Our science-backed weekly sauna schedule offers a customizable framework that works for all sauna types.

Do Sauna Hats Enhance Safety in Infrared Saunas?

While not a safety requirement, a sauna hat can improve your infrared experience by protecting your head from concentrated radiant heat-especially if your sauna has overhead panels. Insulating the head helps regulate overall body temperature, reducing the risk of dizziness and allowing you to enjoy longer, more comfortable sessions. Our 9 Proven Benefits of Wearing a Sauna Hat article details the science behind this accessory. For a lightweight, breathable option, try the Premium Wool Bucket Hat or the stylish Premium Wool Felt Sauna Hat-both designed for optimal heat management.

Frequently Asked Questions

Bringing It All Together

The consensus from decades of research is clear: infrared saunas are safe for the vast majority of users when simple guidelines are followed. Their lower temperatures and deep tissue penetration offer a gentler alternative to traditional saunas, making them accessible even to those with mild heat intolerance.

To make the most of your sessions while staying safe, remember the essentials: hydrate generously, limit time, listen to your body, and consider protective gear like a sauna hat. For more insights, explore our library of evidence-based guides-whether you’re curious about sauna etiquette, the truth about sauna weight loss, or how hot a sauna really gets, we’ve got you covered.

Infrared therapy is a powerful wellness tool when respected. With the right knowledge and gear, you can reap the rewards of deep, healing heat without fear.