Evidence guide

Sauna benefits: promising signals, important limits.

Sauna is enjoyable for many people and has interesting research behind it. The strongest marketing claim, however, is often stronger than the evidence.

What the famous Finnish study found

A prospective cohort study of 2,315 middle-aged men in Eastern Finland reported that more frequent sauna bathing was associated with lower risks of sudden cardiac death, fatal coronary heart disease, fatal cardiovascular disease and all-cause mortality over long follow-up.

What it did not prove

It was observational. People were not randomly assigned to years of different sauna frequencies. That means the study can identify associations but cannot establish that sauna use itself caused the lower mortality risk.

Do infrared saunas inherit the same evidence?

Not automatically. A study of Finnish sauna bathing should not be presented as direct proof that every infrared cabin, temperature, session length or commercial protocol produces the same outcomes.

Practical perspective

If you enjoy sauna, can use it safely and can afford it, it can be a rewarding recovery ritual. Treat it as an addition to — not a replacement for — exercise, sleep, nutrition, preventive care and management of cardiovascular risk factors.

Safety: Heat exposure can affect blood pressure and hydration. People who are pregnant, have unstable cardiovascular disease, fainting problems, significant illness, or take medications that alter blood pressure/fluid balance should seek individualized guidance.

Primary source: Laukkanen T, et al. Association Between Sauna Bathing and Fatal Cardiovascular and All-Cause Mortality Events. JAMA Internal Medicine. 2015.