Infrared saunas have exploded in popularity over the past decade, and with that growth comes a predictable wave of questions: Are infrared saunas safe? Can they cause cancer? What about EMF radiation? Is the heat dangerous for my heart?
These are fair questions. You're sitting inside a wooden box surrounded by electrical heating panels for 20 to 40 minutes at a time. It makes sense to want hard answers before committing to a wellness practice — or dropping several thousand dollars on a unit for your home.
Here's the short answer: yes, infrared saunas are considered safe for most healthy adults when used properly. The Mayo Clinic, peer-reviewed clinical trials, and systematic reviews have all arrived at the same general conclusion — no adverse events have been reported in the published research on far-infrared sauna therapy. But "safe for most people" isn't "safe for everyone," and there are legitimate nuances worth understanding before you start a regular sauna routine.
This guide covers everything: what the clinical evidence actually says, the real risks and side effects to watch for, who should avoid infrared saunas entirely, the EMF debate, and practical safety guidelines for getting the most out of every session.
How Infrared Saunas Work (And Why That Matters for Safety)
Understanding how an infrared sauna heats your body is the first step to understanding its safety profile, because the mechanism is fundamentally different from a traditional sauna.
A traditional Finnish sauna heats the air around you to 170–200°F using an electric or wood-burning heater loaded with stones. Your body heats up because the surrounding air is extremely hot. An infrared sauna uses infrared light — a form of electromagnetic radiation on the non-ionizing end of the spectrum — to warm your body more directly. The air temperature stays significantly lower, typically 110–150°F, while your core body temperature still rises enough to produce a deep sweat.
This distinction matters for safety in several important ways. The lower ambient temperature means less strain on the respiratory system, a reduced risk of burns, and a more tolerable experience for people who find the intense heat of a traditional sauna overwhelming. It also means you can typically stay in longer — which is relevant for the therapeutic benefits tied to sustained, moderate heat exposure.
Infrared light itself is not harmful in the way that ultraviolet or ionizing radiation is. It sits on the low-energy end of the electromagnetic spectrum — the same type of warmth you feel from sunlight (minus the UV rays) or a warm radiator. Hospital neonatal units use infrared warmers for newborns, which speaks to the fundamental safety of the wavelength when applied at appropriate intensities.
What Does the Research Say About Infrared Sauna Safety?
The most reassuring thing about infrared sauna safety isn't a marketing claim — it's the absence of adverse events in published clinical research.
A systematic review published in Canadian Family Physician examined multiple clinical trials on far-infrared sauna therapy, including randomized controlled trials involving patients with congestive heart failure, chronic pain, and cardiovascular risk factors. Across all studies reviewed, no adverse events were reported. The review noted benefits including improvements in blood pressure, endothelial function, exercise tolerance, and chronic pain — all without documented harm.
A 2018 review published in Mayo Clinic Proceedings examined the broader evidence on sauna bathing and health. The authors concluded that sauna bathing is a well-tolerated activity with a good safety profile, and that evidence suggests it is safe even for patients with stable cardiovascular disease, including those who have recovered from a heart attack or who have compensated heart failure.
A 2021 randomized controlled crossover trial published in the Journal of Complementary Therapies in Medicine compared infrared sauna sessions to moderate exercise in healthy women. The study found that infrared sauna exposure produced thermoregulatory and cardiovascular responses similar to moderate physical activity, and participants were monitored throughout with no adverse events reported.
The consistent finding across the literature is straightforward: for healthy adults following standard usage guidelines, infrared saunas carry a very low risk profile. The caveats — and there are some — involve specific medical conditions, medications, and improper use, which we'll cover in detail below.
Real Risks and Side Effects of Infrared Sauna Use
Calling infrared saunas "safe" doesn't mean they're risk-free. Like any heat therapy — or even a hot bath — there are real side effects that can occur, particularly if you push too hard, skip hydration, or ignore your body's warning signals.
Dehydration
This is the most common risk, and it's entirely preventable. A typical 30-minute infrared sauna session can produce significant sweat loss. If you're not adequately hydrated before, during, and after your session, you can experience dizziness, fatigue, headaches, and in severe cases, heat exhaustion. Drink at least one to two glasses of water in the hour before your session, and replenish fluids and electrolytes afterward. Coconut water or water with a pinch of salt can help restore what you've lost through sweat.
Overheating and Heat Exhaustion
Spending too long in the sauna or setting the temperature too high — especially as a beginner — can push your body past its ability to regulate core temperature. Symptoms include nausea, rapid heartbeat, weakness, confusion, and lightheadedness. If you experience any of these, end your session immediately, move to a cool environment, and hydrate. Most experts recommend keeping sessions under 30 minutes and starting with shorter 10–15 minute sessions if you're new to sauna use.
Blood Pressure Changes
Heat exposure causes vasodilation — your blood vessels widen to help dissipate heat. This naturally lowers blood pressure, which is actually one of the documented health benefits of regular sauna use. But for people who already have low blood pressure or who are taking antihypertensive medications, this drop can cause lightheadedness or fainting, particularly when standing up quickly after a session. Always exit the sauna slowly and sit for a few minutes before standing.
Skin Sensitivity
While many users report improved skin tone and clarity with regular infrared sauna use, people with active eczema, rosacea, or other inflammatory skin conditions may find that heat temporarily worsens irritation. If you have a sensitive skin condition, start with shorter sessions at lower temperatures and monitor your skin's response.
Temporary Effects on Fertility
One small 2013 study found that regular sauna exposure (two sessions per week for three months at 15 minutes each) was associated with temporarily reduced sperm count and motility. These effects reversed after sauna use was discontinued. If you're actively trying to conceive, it may be worth discussing sauna frequency with your doctor.
Who Should Avoid Infrared Saunas?
While infrared saunas are safe for the majority of healthy adults, certain groups need to exercise caution or avoid sauna use altogether. This isn't about the infrared technology being inherently dangerous — it's about how heat stress interacts with specific medical conditions and physiological states.
Pregnant Women
The American College of Obstetricians and Gynecologists (ACOG) advises against sauna and hot tub use during pregnancy. Raising core body temperature above approximately 102°F — which can happen within 10 to 20 minutes of heat exposure — may increase the risk of neural tube defects and other complications, particularly during the first trimester. If you're pregnant, avoid infrared saunas until after delivery and until you've received medical clearance from your physician.
People With Cardiovascular Conditions
While research suggests that sauna therapy can actually benefit people with stable cardiovascular disease, anyone with unstable angina, recent heart surgery, decompensated heart failure, or uncontrolled high or low blood pressure should not use an infrared sauna without explicit medical clearance. Heat stress increases cardiac output and heart rate — your heart rate can increase by approximately 30 beats per minute for each degree of core temperature rise — and this added demand can be dangerous for people with compromised cardiac function.
People Taking Certain Medications
Several classes of medication can impair your body's ability to regulate temperature or respond to heat stress. These include diuretics, beta-blockers, barbiturates, anticholinergics (such as amitriptyline), and some antihistamines. If you take any prescription medications — particularly those affecting blood pressure, heart rate, or sweating — consult your doctor before using an infrared sauna.
Children
Children's core body temperature rises faster than adults' due to a higher metabolic rate relative to body mass, limited circulatory adaptation, and a reduced ability to regulate temperature through sweating. Most manufacturers and medical professionals recommend that children under 12 avoid infrared saunas entirely, and that older children use them only under adult supervision, at lower temperatures, and for no more than 15 minutes.
People With Pacemakers or Defibrillators
The magnets used in sauna construction can potentially interfere with the function of pacemakers and implanted defibrillators. If you have an implanted cardiac device, discuss infrared sauna use with your cardiologist before proceeding.
Other Conditions Requiring Caution
Additional conditions that warrant medical consultation before sauna use include multiple sclerosis, diabetes with neuropathy (due to impaired ability to sense heat), hemophilia or bleeding disorders, active infections or fever, recent acute joint injuries (within 48 hours), and any condition that impairs the ability to sweat.
The EMF Question: Should You Be Concerned?
EMF — electromagnetic fields — is one of the most debated topics in the infrared sauna world. Because infrared saunas surround you with electrical heating panels, and because you're sitting in close proximity to those panels for extended periods, the question of EMF exposure comes up constantly.
Here's what you need to know. Every electrical device in your home produces some level of EMF — your phone, your refrigerator, your hair dryer, your Wi-Fi router. Infrared sauna heaters are no different. The EMFs produced by infrared saunas are non-ionizing, meaning they don't carry enough energy to damage DNA or cells the way ionizing radiation (like X-rays or gamma rays) can.
International safety organizations, including the World Health Organization (WHO) and the International Commission on Non-Ionizing Radiation Protection (ICNIRP), have established safety thresholds for EMF exposure. The magnetic field safety threshold is set at 2,000 milligauss (mG) at 60Hz, and the electric field threshold at 4,200 V/m. Well-designed infrared saunas typically produce EMF levels that are a small fraction of these thresholds.
That said, the debate isn't entirely settled. Some researchers argue that current safety guidelines don't adequately account for chronic, low-level exposure, and a handful of epidemiological studies have suggested associations between prolonged EMF exposure and certain health outcomes — though these studies involved occupational exposure levels far beyond what a home sauna produces.
Our practical recommendation: choose a low-EMF or ultra-low-EMF infrared sauna from a reputable manufacturer that provides third-party EMF testing data. This is especially important if you plan to use your sauna frequently (4+ times per week) or if EMF sensitivity is a personal concern. The best manufacturers have invested significantly in reducing EMF emissions through advanced heater design, shielded wiring, and strategic component placement.
Most of the infrared saunas we carry fall into three EMF tiers: Low EMF (6–10 mG), Ultra-Low EMF (under 3 mG), and Near-Zero EMF (under 2 mG, sometimes under 1 mG). If EMF is a priority for you, our guide to EMF levels in infrared saunas breaks down exactly what these terms mean and how they're measured. You can also explore our FAR infrared saunas, which are built with low-EMF carbon panel technology designed for safe, even heat distribution.
Do Infrared Saunas Cause Cancer?
This is one of the most common fears people have, and it deserves a direct answer: there is no scientific evidence that infrared saunas cause cancer.
The confusion usually stems from a misunderstanding of the electromagnetic spectrum. Infrared radiation is non-ionizing — it does not have the energy to break chemical bonds, damage DNA, or trigger the cellular mutations that lead to cancer. This fundamentally distinguishes it from ionizing radiation like UV light, X-rays, and gamma rays.
In fact, some preliminary research suggests that regular heat exposure through sauna use may have protective effects. The large-scale Finnish KIHD study, which followed over 2,000 men for more than 20 years, found that frequent sauna use was associated with reduced risk of several chronic diseases. While these findings are primarily from traditional Finnish saunas, the cardiovascular and inflammatory mechanisms involved are similar to those activated by infrared sauna use.
One area that does warrant nuance is near-infrared radiation. Some dermatological research has raised questions about whether high-intensity, prolonged near-infrared exposure could contribute to skin photoaging — similar to the effect of UV exposure — by affecting collagen-degrading enzymes and potentially interfering with cellular repair mechanisms. However, these findings are largely from laboratory studies using specific intensities that may not translate directly to real-world sauna use, and they apply primarily to near-infrared wavelengths, not the far-infrared wavelengths used in most home saunas.
If this is a concern for you, a far-infrared sauna — which operates exclusively in the far-infrared wavelength range — eliminates this consideration entirely. For those interested in full-spectrum models that include near-infrared, reputable brands use appropriate intensities and exposure durations that fall well within safe parameters.
Infrared Sauna Safety Tips: How to Use One Properly
Following evidence-based usage guidelines is the single most important thing you can do to ensure your infrared sauna experience is both safe and beneficial. Most of the risks associated with infrared sauna use — dehydration, overheating, blood pressure drops — are almost entirely preventable with proper habits.
Get Medical Clearance If Needed
If you have any pre-existing health condition, take prescription medications, are pregnant, or have concerns about heat exposure, talk to your doctor before starting a sauna routine. This isn't a formality — it's a genuine safety step.
Start Slow and Build Up
If you're new to infrared saunas, begin with 10–15 minute sessions at a moderate temperature (110–120°F). As your body acclimates over a few weeks, you can gradually increase session length toward 20–30 minutes and raise the temperature to your comfort level. Most experienced users find their sweet spot between 120°F and 140°F.
Stay Hydrated — Before, During, and After
Drink at least one to two glasses of water within the hour before your session. After your session, replenish both fluids and electrolytes. Avoid alcohol before or immediately after sauna use, as alcohol impairs your body's thermoregulation and judgment, and amplifies dehydration.
Keep Sessions Under 30 Minutes
Research and manufacturer guidelines generally recommend capping sessions at 30 minutes. Going longer increases the risk of dehydration and heat stress without a proportional increase in benefits. Most clinical studies showing positive outcomes used session lengths of 15 to 30 minutes.
Listen to Your Body
If you feel dizzy, nauseous, lightheaded, or unusually fatigued during a session, stop immediately. Exit the sauna, sit in a cool area, and hydrate. These are early signs of heat exhaustion and should not be ignored. More serious warning signs — rapid heartbeat, confusion, or inability to sweat — indicate you need to stop and potentially seek medical attention.
Limit Frequency for Beginners
Three to four sessions per week is a common recommendation for regular users. Beginners should start with two to three sessions per week and allow their body to adapt. The benefits of sauna use are cumulative and tied to consistency rather than intensity.
Avoid Bringing Plastic Inside
Don't bring plastic water bottles or containers into the sauna cabin. Heat can cause plastics to release chemicals that may leach into your water or the air. Use a glass or stainless steel water bottle, and keep it outside the sauna door within easy reach.
Are Infrared Saunas Safer Than Traditional Saunas?
This comes up frequently, and the answer has some nuance. Both types of saunas have strong safety profiles when used correctly. However, infrared saunas do offer some practical safety advantages that make them more accessible for a wider range of people.
The lower operating temperature (110–150°F vs. 170–200°F) reduces the risk of burns, makes respiratory discomfort less likely, and puts less acute stress on the cardiovascular system. This makes infrared saunas generally more tolerable for older adults, people with mild cardiovascular concerns (with medical clearance), and anyone who finds the extreme heat of a traditional sauna overwhelming.
Infrared saunas also heat up faster, use less energy, and can be installed in smaller spaces — which removes barriers to consistent use. And consistency is what drives the health benefits. The best sauna is the one you'll actually use regularly. If a home infrared sauna makes that habit easier to build, it may be the safer choice simply because you're more likely to stick with it.
For people who want the flexibility to switch between both experiences, hybrid saunas combine infrared and traditional heating in a single unit — giving you access to both modalities without needing two separate saunas.
How to Choose a Safe Infrared Sauna
Not all infrared saunas are built to the same standard. If safety is a priority — and it should be — here are the key factors to evaluate when choosing a unit.
EMF testing and transparency. Look for manufacturers that provide third-party EMF testing data — not just on the heater panels in isolation, but on the fully assembled unit including the power supply. Some brands test only the heater and omit the power supply, which can be the largest source of EMF in the cabin. Our EMF comparison guide explains the differences between low, ultra-low, and near-zero EMF models in detail.
Safety certifications. Every infrared sauna you consider should carry recognized electrical safety certifications — ETL, CETL, CE, or equivalent. These certifications mean the unit has been tested by an independent lab for electrical safety, fire risk, and proper construction. All of the infrared saunas we carry hold ETL, CETL, and CE safety certifications.
Wood quality. The wood your sauna is made from matters for safety. High-quality, kiln-dried woods like Western Red Cedar, Canadian Hemlock, and thermally modified Aspen or Spruce won't off-gas harmful chemicals when heated. Cheaper saunas made from lower-grade wood or wood treated with stains and sealants can release volatile organic compounds (VOCs) at sauna operating temperatures. Look for untreated, sauna-grade wood from reputable sources.
Heater type and placement. Carbon fiber heating panels are the current standard for most quality infrared saunas. They produce even, broad-coverage far-infrared heat at lower surface temperatures than older ceramic heaters, which translates to a more comfortable experience with lower EMF. The best saunas feature panels on multiple walls, under the bench, and sometimes the floor — providing full-body coverage without hot spots. For a deeper dive into heater technology, our infrared sauna buyer's guide covers everything you need to know.
Manufacturer reputation and warranty. A reputable manufacturer stands behind their product with a meaningful warranty (typically 5–7 years on the cabin and a lifetime warranty on heaters for top brands). This isn't just about protection if something breaks — it's an indicator that the company is confident in the safety and durability of their product.
The Bottom Line
Infrared saunas are one of the most well-tolerated, low-risk wellness tools available. The published clinical evidence consistently shows a strong safety profile with no adverse events reported across multiple studies involving diverse patient populations — including people with cardiovascular disease, chronic pain, and chronic fatigue.
The real risks — dehydration, overheating, blood pressure changes — are almost entirely preventable with basic precautions: stay hydrated, keep sessions reasonable, listen to your body, and get medical clearance if you have any health conditions that interact with heat exposure.
If you're ready to explore infrared saunas for your home, browse our full infrared sauna collection or start with our guide to infrared sauna benefits to understand what regular use can do for your health. For personalized help choosing the right model, our Sauna Selector Tool can match you with the best option for your space, budget, and wellness goals — or reach out to our team directly via live chat.
*Haven Of Heat and its affiliates do not provide medical advice. All content published on this website is for general informational and educational purposes only and should not be relied upon as a substitute for advice from qualified healthcare professionals. Always consult a licensed medical provider regarding health-related questions before starting any new wellness practice, including the use of infrared saunas.
Leave a comment