Sauna Use: Does It Actually Improve Your Health?

Sauna use has become popular again, often promoted for heart health, longevity, and recovery. But how much of this is real?

The answer is: there is strong observational evidence suggesting benefit, but we still need more clinical trials to confirm it.

What is a sauna?

A sauna is a heated environment that raises your body temperature.

There are different types:

• Traditional (dry heat) saunas

• Infrared saunas

Most of the research has been done on traditional Finnish saunas.

What does the research show?

Cardiovascular and mortality benefits

The strongest data comes from a large Finnish study called the Kuopio Ischemic Heart Disease (KIHD) cohort, which followed over 2,000 men.

Compared to those who used the sauna once per week, people who used it 4–7 times per week had:

• 63% lower risk of sudden cardiac death

• 48–50% lower risk of fatal cardiovascular disease

• 40% lower risk of all-cause mortality

There was also a dose-response relationship, meaning:
The more frequently people used the sauna, the greater the benefit.

Duration matters too

Longer sessions were associated with greater benefit.

• Sessions over 19 minutes
  → linked to a 52% lower risk of sudden cardiac death
  (compared to sessions under 11 minutes)

Blood pressure

Sauna use has been shown to:

• Lower systolic blood pressure by about 4 mmHg

• Lower diastolic blood pressure by about 4 mmHg

Even small reductions like this can have meaningful effects over time.

Brain health

In the same Finnish cohort:

• 66% lower risk of dementia

• 65% lower risk of Alzheimer’s disease

Possible explanations include:

• Increased blood flow to the brain

• Activation of heat shock proteins, which may help reduce harmful protein buildup

Heart failure

Sauna use is also being studied in people with heart failure.

Small controlled studies have shown:

• Lower BNP (a marker of heart strain)

• Improved heart function (ejection fraction)

• Better blood vessel function

This suggests sauna use may support heart health even in people with existing disease.

How does sauna use affect the body?

Sauna bathing creates several physiological changes:

• Heart rate increases to 100–150 beats per minute
  (similar to light to moderate exercise)

• Blood vessels relax → improved circulation

• Blood pressure decreases

• Sweating increases (about 0.5 kg per session)

It may also:

• Reduce inflammation

• Improve antioxidant activity

• Improve endothelial (blood vessel) function

Is sauna use safe?

For most people, sauna use is safe.

Generally safe for:

• Healthy adults

• People with stable cardiovascular disease

Avoid or use caution if you have:

• Unstable angina

• Recent heart attack

• Severe aortic stenosis

Important safety tips

• Do not drink alcohol before or during sauna use
  → increases risk of low blood pressure, arrhythmias, and sudden death

• Stay hydrated
  → you can lose significant fluid through sweat

Important limitations of the research

While the data is impressive, there are important caveats:

• Most long-term outcome data comes from one Finnish population

• Participants were primarily men

• Results may not apply to:

  • Women

  • Other ethnic groups

  • Different sauna types (like infrared)

Could something else explain the benefits?

Possibly.

People who use saunas frequently may also:

• Exercise more

• Have healthier diets

• Experience less stress

• Spend more time relaxing or socializing

These factors could contribute to the observed benefits.

Bottom line

Sauna use is associated with:

• Lower cardiovascular risk

• Lower overall mortality

• Potential brain health benefits

There is also:

• A clear dose-response relationship

• Plausible biological mechanisms

However:

Most of the evidence is observational, not definitive.
More research is needed before making strong recommendations.

How I think about sauna use

Sauna use can be a helpful tool.

It may:

• Support cardiovascular health

• Help with relaxation and recovery

• Provide benefits similar to light exercise

But it should not replace:

• Exercise

• Nutrition

• Sleep

Final takeaway

Sauna use appears to be safe and potentially beneficial, especially when used regularly.

But like many things in health:

It works best as part of a larger system—not as a standalone solution.

If you enjoy it and tolerate it well, it’s reasonable to include it as part of a healthy lifestyle.