For centuries, the Finnish sauna has been more than a place to warm up. It's part of daily life and a space to pause, recharge, and connect with others. Now, modern research suggests that this long-standing ritual is also a potent health practice, with benefits reaching far beyond relaxation⁽¹⁾.

A “Passive Workout” for the Body

A sauna session can feel like rest, but physiologically, it resembles gentle exercise. As your body warms, heart rate increases, blood vessels widen, and circulation accelerates. Sweating intensifies, and blood pressure temporarily dips, giving the arteries a restorative break. In many people, heart rate during a sauna reaches the same level as during brisk walking or light jogging, all while seated in stillness⁽²⁾.

What Happens in a Traditional Sauna?

A Finnish sauna is a wood-lined room heated to 80–100°C (176–212°F) with low humidity. Pouring water over hot stones produces short bursts of steam and a sudden rise in warmth. Typical sessions last 5–20 minutes, followed by cooling off in fresh air, a shower, or even a plunge into cold water. Many people repeat this cycle several times.

During a session:

• Heart rate can climb to 120–150 beats per minute
• Arteries relax and widen, improving blood flow
• Blood pressure temporarily decreases
• Sweating removes fluids and helps regulate body temperature

In short, the sauna places the cardiovascular system under healthy, controlled stress similar to exercise but experienced as calm rather than exertion⁽³⁾.

Cardiovascular Protection

Finland provides a unique window into sauna health because frequent sauna bathing is such an integral part of cultural life. 

Large population studies there have linked regular sauna use with:

• Lower blood pressure. A 30-minute session can reduce pressure to a degree comparable with some medications.
• More flexible arteries. Arterial stiffness declines immediately after use, echoing the effects of aerobic exercise.
• Reduced risk of heart disease and sudden cardiac death. Men who used a sauna 4–7 times per week had up to a 50% lower risk compared with those who went only once weekly.

The evidence suggests that repeated exposure to heat trains the heart and blood vessels to adapt, improving resilience over time⁽¹⁾.

Brain and Memory Health

Intriguingly, the benefits appear to extend to the brain. In a long-term Finnish study, men who used the sauna 4–7 times weekly had about a 65% lower risk of developing dementia or Alzheimer’s disease than those who went only once⁽⁴⁾.

The precise mechanisms are still under investigation, but several explanations are likely including improved blood flow to the brain, reduced inflammation, lower blood pressure, and cardiovascular protection all contribute to preserving cognitive health.

Respiratory Benefits and Immunity

For those with asthma or chronic bronchitis, sauna use may ease breathing by opening airways. Research also suggests that regular sauna users experience fewer colds and respiratory infections. One theory is that the heat mimics a mild fever, briefly raising body temperature and stimulating immune defenses⁽⁵⁾.

Relief for Pain, Stress, and Skin

While there are substantial benefits for heart health, heat exposure offers more than cardiovascular benefits.

Studies have shown that sauna bathing can:

• Reduce joint pain from arthritis and fibromyalgia
• Lessen tension headaches
• Improve skin hydration and barrier function
• Trigger endorphin release, producing natural pain relief and a sense of well-being

Many sauna users describe a unique after-effect of deep calm with a feeling of lightness in the body, as muscle tension eases and mental stress fades⁽⁶⁾.

Figure: Pleiotropic effects (proposed mechanistic pathways) of Finnish sauna baths. CRP = C-reactive protein; HDL-C = high-density lipoprotein cholesterol; LDL-C = low-density lipoprotein cholesterol; NO = nitric oxide; ROS = reactive oxygen species; TC = total cholesterol. Adapted from Laukkanen, 2018)⁽¹⁾

Safety Considerations

For most healthy adults, sauna use is safe. Even people with stable cardiovascular conditions, such as controlled high blood pressure or prior heart attacks, can usually participate safely under medical guidance.

The main cautions:

• Avoid sauna bathing if you have unstable heart disease or uncontrolled blood pressure
• Never mix sauna use with alcohol, which sharply increases the risk of fainting, arrhythmias, and accidents
• Prolonged heat exposure or sudden plunges into icy water can stress the body

When practiced responsibly, sauna bathing has an excellent safety record.

Sauna and Exercise: Stronger Together

Evidence suggests that combining exercise and sauna use provides the greatest health protection. Physical activity strengthens the heart, lungs, and muscles, while sauna enhances cardiovascular conditioning and aids recovery. Together, they appear to reduce the risk of premature death more than either practice alone.

The Takeaway

The Finnish sauna is more than a cultural tradition. Evidence now shows it can lower blood pressure, protect the heart, reduce dementia risk, ease pain, and support respiratory and immune health.

While research continues to clarify the exact biological pathways, one message is clear: used wisely, heat can heal. For those unable to exercise regularly or anyone seeking an enjoyable way to support long-term health, sauna bathing may be one of the most pleasant prescriptions available.

You know what goes great with a relaxing sauna session? A good nights sleep. It's the perfect combination to turn any tough day around and wake up refreshed. 

If you love getting a great night's sleep and want to wake up RESTED-AF you'll want to try this!

References: 
    1.    Laukkanen JA, Laukkanen T, Kunutsor SK: Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence. Mayo Clin Proc 93:1111-1121, 2018
    2.    Crandall CG, Wilson TE, Marving J, et al: Effects of passive heating on central blood volume and ventricular dimensions in humans. J Physiol 586:293-301, 2008
    3.    Heinonen I, Brothers RM, Kemppainen J, et al: Local heating, but not indirect whole body heating, increases human skeletal muscle blood flow. J Appl Physiol (1985) 111:818-24, 2011
    4.    Laukkanen T, Kunutsor S, Kauhanen J, et al: Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men. Age and Ageing 46:245-249, 2017
    5.    Kunutsor SK, Laukkanen T, Laukkanen JA: Frequent sauna bathing may reduce the risk of pneumonia in middle-aged Caucasian men: The KIHD prospective cohort study. Respir Med 132:161-163, 2017
    6.    Nurmikko T, Hietaharju A: Effect of exposure to sauna heat on neuropathic and rheumatoid pain. Pain 49:43-51, 1992