Sauna Benefits: The Evidence for Infrared and Traditional Saunas

Search for infrared sauna benefits and you will find claims ranging from the credible to the frankly invented. The truth is more useful than either the hype or the cynicism: there is genuinely strong evidence that regular sauna use is good for you, most of it from decades of research on traditional Finnish saunas, plus a smaller and more mixed body of work on infrared. This guide separates what the science actually supports from what is wishful marketing, so you can decide whether a sauna earns its place in your week.

Where the strong evidence comes from

Most of the robust research is on hot, traditional Finnish saunas, not infrared. The standout is a long-running study from the University of Eastern Finland that followed more than 2,000 middle-aged men for over two decades, tracking how often they used a sauna against their long-term health.

The results were striking. Men who used a sauna four to seven times a week had a markedly lower risk of fatal cardiovascular disease and lower all-cause mortality than those using it once a week. Even two to three sessions a week was associated with a meaningfully lower risk of fatal heart problems. Longer sessions of around 15 to 20 minutes showed the strongest associations.

One honest caveat runs through all of this: these are largely observational studies. They show a strong association, not cast-iron proof of cause, and randomised trials have been smaller and more mixed. The Mayo Clinic Proceedings review of the evidence is the best neutral summary if you want to read the detail yourself.

The benefits the research actually supports

Bearing that caveat in mind, here is where the evidence is genuinely encouraging:

• Cardiovascular health. This is the strongest area. Regular sauna use is associated with lower blood pressure, better blood-vessel (endothelial) function and a reduced risk of cardiovascular death.
• It mimics gentle exercise. Sitting in the heat raises your heart rate and dilates blood vessels in a way that resembles moderate physical activity, which is part of why the cardiovascular effects appear.
• Lower risk of stroke and dementia. The Finnish cohort data linked frequent sauna use with a reduced risk of both, again as an association rather than proof.
• Recovery and relaxation. Heat eases muscle tension and triggers a strong relaxation response, which is one of the most reliable and immediate effects most people feel.
• Respiratory comfort. Regular users report fewer or milder respiratory infections, and the warm air can feel soothing when you are congested. Our guide on whether a sauna is good for a cold covers the sensible limits here.
• Sleep. Many people find an evening sauna helps them wind down and sleep more deeply, likely tied to the relaxation response and the post-sauna drop in body temperature.

What about infrared specifically?

Infrared saunas heat your body directly with radiant panels at a lower air temperature, typically around 45 to 60C rather than the 70 to 90C of a Finnish sauna. That makes them more tolerable for people who find traditional heat overwhelming.

The honest position is that the evidence for infrared is thinner than for traditional saunas. The large cohort studies were done on Finnish saunas, so you cannot simply transfer their numbers to an infrared cabin. That said, there is some promising work: far-infrared “Waon therapy” has been studied in Japan for heart failure with encouraging results, and small studies suggest infrared use can lower blood pressure and aid recovery. What you should be wary of are specific claims about “detox”, fat-burning or curing conditions, which run well ahead of the data. If a benefit sounds too good, it usually is.

For a fuller picture of how the different types compare, our guides to Finnish sauna culture and the traditional sauna temperature range are a good next read.

How to actually get the benefits

The research points to a fairly simple routine:

• Aim for regular use, several times a week, rather than the occasional marathon session. Frequency did more work in the studies than any single visit.
• Keep sessions to around 15 to 20 minutes, the range associated with the best outcomes, and build up gradually.
• Hydrate before and after, because you lose a lot of fluid.
• Cool down between rounds; many people pair the heat with a cold plunge, which our guide to the sauna and cold plunge contrast explains.

A necessary safety note

Saunas are safe for most healthy adults, but the heat is a real physiological stress. Avoid alcohol before and during, get out if you feel dizzy or unwell, and do not use a sauna if you are unwell with a fever. If you are pregnant, have a heart condition, low blood pressure or any serious health issue, talk to your doctor before starting. The benefits above are for generally healthy people using a sauna sensibly, not a substitute for medical treatment.

Frequently asked questions

Are infrared sauna benefits proven by research? Partly. The strongest evidence, on cardiovascular health and mortality, comes from studies of traditional Finnish saunas rather than infrared. Infrared has a smaller, more mixed evidence base, with some promising results for blood pressure and recovery, but claims about detox or fat loss are not well supported.

How often should you use a sauna to see benefits? The research associated the biggest benefits with frequent use, around four to seven times a week, though two to three sessions a week still showed clear cardiovascular advantages. Consistency matters more than the length of any single session.

How long should a sauna session be? Around 15 to 20 minutes is the range linked with the best outcomes in the Finnish studies. If you are new to it, start with shorter sessions and build up as you get used to the heat.

Is an infrared or a traditional sauna better for health? Traditional saunas have the stronger evidence base simply because that is what the large studies used. Infrared saunas are gentler and easier to tolerate, which may suit people who find high heat uncomfortable, but you should not assume the Finnish study numbers apply directly to them.

Who should avoid saunas? Anyone with a fever, and people who are pregnant or have heart conditions, low blood pressure or other serious health issues should check with a doctor first. Everyone should avoid combining saunas with alcohol and should get out promptly if they feel faint.