What Is An Infrared Sauna? Simplified

An infrared sauna is a heated room or cabin that uses infrared light to warm your body directly, rather than heating the air around you like a traditional sauna. Traditional saunas use hot stones or a stove to raise the air temperature to 150°F–200°F. Infrared saunas use infrared panels that emit radiant heat, which is absorbed by your skin and tissues. This allows the air temperature to stay much lower, typically between 120°F and 140°F, while still producing heavy sweating and a feeling of deep warmth.

How Does an Infrared Sauna Actually Work?

Infrared radiation is a type of electromagnetic energy. You feel it every day as heat from the sun, a fireplace, or a warm sidewalk. Unlike ultraviolet (UV) radiation, infrared does not damage skin cells or cause sunburn. It simply transfers heat energy.

When infrared waves hit your skin, they penetrate about 1 to 2 inches into the body. This is deeper than the surface heating you get from a traditional sauna. The heat causes blood vessels near the skin to widen, a process called vasodilation. Your heart rate increases, blood flow rises, and you begin to sweat. This is the body’s natural way of cooling itself down.

The key difference is efficiency. Because the energy goes directly into your body instead of warming a large volume of air, you sweat sooner and often more heavily at a lower air temperature. Many people find this more comfortable, especially those who feel claustrophobic or overwhelmed by the intense heat of a traditional sauna.

What Is an Infrared Sauna: Types and How They Differ

There are three main types of infrared saunas, classified by the wavelength of light they emit. The type matters because different wavelengths penetrate tissue differently.

Near-infrared has the shortest wavelength. It penetrates the skin surface and is often used in targeted devices rather than full-room saunas. Some research suggests it may help with wound healing and skin conditions, though large human trials are limited.

Far-infrared has the longest wavelength. It is the most common type found in commercial sauna rooms. It produces a deep, even warmth that most people associate with an infrared sauna experience. Most of the health research on infrared saunas uses far-infrared panels.

Full-spectrum saunas combine near, mid, and far wavelengths. Manufacturers claim this offers the benefits of all types. However, no strong clinical evidence confirms that full-spectrum units outperform far-infrared alone.

When you see a sauna advertised as “infrared,” it is almost always a far-infrared model. If you are comparing units, check the wavelength specifications rather than trusting marketing language about “detox” or “healing.”

What Does the Evidence Say About Health Benefits?

Research on infrared saunas is growing but still limited compared to traditional saunas. Some studies suggest real benefits. Others are too small or poorly designed to draw firm conclusions.

One area with promising evidence is cardiovascular health. Several studies have found that regular infrared sauna sessions produce changes similar to moderate exercise. Heart rate increases, blood pressure drops temporarily, and blood vessel function improves. A well-known body of research from Finland, where sauna bathing is a cultural tradition, found that frequent sauna use was associated with lower risks of heart disease and stroke. However, that research focused on traditional saunas, not infrared specifically.

Some studies suggest infrared saunas may help with muscle recovery and joint pain. The heat increases blood flow to muscles and connective tissue, which can reduce stiffness. People with rheumatoid arthritis and chronic fatigue syndrome have reported symptom relief in small trials. The evidence is encouraging but not definitive.

For relaxation and stress reduction, the evidence is more straightforward. The warmth, quiet time, and release of endorphins during a session promote relaxation. Many users report improved sleep after regular use. This effect is well supported by subjective reports and basic physiology, even if large controlled trials are lacking.

Claims about toxin removal require caution. Your body removes toxins primarily through the liver and kidneys, not the skin. Sweat does contain trace amounts of heavy metals and other substances, but no clinical evidence shows that sweating more removes toxins in a way that improves health. The idea that infrared saunas “detoxify” the body is a marketing claim, not a proven medical benefit.

What Happens to Your Body During a Session

A typical infrared sauna session lasts 20 to 45 minutes. During that time, your core body temperature rises by 1 to 2 degrees. This triggers a mild fever-like state that activates heat shock proteins, which help cells repair damage and reduce inflammation.

Your cardiovascular system responds as if you were doing light exercise. Your heart rate may increase from a resting 60–100 beats per minute to 100–150 beats per minute, depending on the temperature and your fitness level. Blood pressure often drops during and immediately after a session, then returns to baseline.

You will sweat—often heavily. This fluid loss means you should drink water before and after your session. A person can lose up to 1 to 2 pints of sweat during a 30-minute session, though this varies widely between individuals.

The experience is generally safe for healthy adults. But it is not without risks, and certain people should avoid it or get medical clearance first.

Who Should Be Cautious or Avoid Infrared Saunas?

Infrared saunas raise your core body temperature and stress your cardiovascular system. For healthy people, this is manageable. For others, it can be dangerous.

People with heart conditions should consult a doctor before using any sauna. The increased heart rate and blood vessel dilation can strain an already weakened heart. If you have unstable angina, recent heart attack, or severe aortic stenosis, sauna use is generally not recommended.

Pregnant women should avoid infrared saunas. Raising core body temperature above 102°F during early pregnancy has been associated with an increased risk of birth defects. No clinical guidelines establish a safe temperature threshold for infrared sauna use during pregnancy, so the conservative recommendation is to avoid it entirely.

People taking blood pressure medications should be cautious. These medications can affect how your body regulates temperature and blood pressure. Combining them with sauna heat may cause blood pressure to drop too low, leading to dizziness or fainting.

Older adults and those with balance issues face a higher risk of falling, especially when standing up quickly after a session. Dehydration is also a concern, as the sense of thirst diminishes with age.

Anyone with a fever, active infection, or skin condition should wait until they recover. Alcohol should never be consumed before or during a sauna session, as it increases the risk of dehydration and heat-related illness.

How Often Can You Use an Infrared Sauna?

There is no universally agreed frequency for infrared sauna use. Most clinical studies that showed benefits used sessions of 20 to 30 minutes, two to three times per week. Some people use them daily without problems, but that is not necessary to see benefits.

Listen to your body. If you feel dizzy, nauseated, or excessively fatigued after a session, you are overdoing it. Start with shorter sessions at lower temperatures—10 to 15 minutes—and gradually increase as you become accustomed to the heat.

Always hydrate before and after. Weighing yourself before and after a session can help you estimate fluid loss. For every pound lost, drink about 16 to 20 ounces of water.

Infrared vs. Traditional Sauna: Which Is Better?

Neither type is objectively better. They produce different experiences with different trade-offs.

Traditional saunas reach much higher air temperatures, which some people find more intense and satisfying. They also have a longer history of research, particularly the Finnish studies on cardiovascular outcomes. The dry heat can feel harsher on the respiratory tract, but some people enjoy the ritual of pouring water on hot stones to create steam.

Infrared saunas operate at lower air temperatures, which feels more tolerable for longer sessions. They warm up faster—often in 10 to 15 minutes versus 30 to 60 minutes for a traditional sauna. They are also more energy-efficient and easier to install in a home because they do not require special ventilation for steam.

If your goal is cardiovascular conditioning, both types elevate heart rate and blood flow. If your goal is deep relaxation at a comfortable temperature, infrared may be the better fit. If you prefer intense, traditional heat, a classic sauna might serve you better.

What to Look for When Buying or Using One

If you are considering a home infrared sauna, quality matters. Look for units made with solid wood—hemlock, cedar, or basswood are common—rather than cheap composites that may warp or off-gas. Check that the infrared panels are certified by a recognized testing laboratory for electrical safety.

Consider the size. A one-person sauna is compact but can feel cramped. A two-person unit offers more room to stretch out and is a better long-term investment for many households.

Temperature control and session timers are standard features. Some units include chromotherapy lighting or sound systems, but these add cost without adding medical benefit.

For public saunas, ask about cleaning protocols. Sweat is a breeding ground for bacteria, and surfaces should be wiped down between users. If you have any open cuts or skin infections, skip the session until they heal.