Where Sauna and Infrared Sauna Evidence Is Covered on This Site
A short guide to where sauna and infrared sauna evidence lives on this site, with the heat safety points that apply first and how the hydrotherapy library fits.
Content last updated . This page has not been medically reviewed.
Why This Page Exists
People who search for "sauna benefits" or "infrared sauna" are usually looking for the Biohacking section, which owns this evidence. The hydrotherapy library covers saunas and steam rooms only as related heat practices offered beside baths and pools, and links to those pages instead of copying them.Where to Go
| If you want to know | Go to |
|---|---|
| What studies found for traditional sauna | More about What studies found for traditional sauna → |
| What studies found for infrared sauna | More about What studies found for infrared sauna → |
| How the two compare | More about How the two compare → |
| Cold and heat exposure together | More about Cold and heat exposure together → |
| Heart conditions and temperature exposure | More about Heart conditions and temperature exposure → |
| Cold shock, fainting and burns | More about Cold shock, fainting and burns → |
The Hydrotherapy View
Here, saunas and steam rooms are covered in saunas and steam rooms and steam rooms and steam baths. For the safety hazards see heat illness, dehydration and overheating and fainting after hot water. A direct comparison of the two rooms is at sauna vs steam room.A Few Findings, Briefly
This is orientation, not the full evidence. A large Finnish study of 2,315 middle-aged men found a lower hazard of sudden cardiac death with 4 to 7 sessions per week, and its authors called for more studies on the mechanism. [2] A systematic review of 40 clinical studies found only 13 were randomized trials and most were small. [3] An infrared sauna meta-analysis of 7 studies found short-term improvement in cardiac function in people with heart conditions, with evidence strength from moderate to insufficient. [4] The strength of evidence for each claim is on the linked Biohacking pages.Frequently asked questions
Where is the sauna evidence?
On the Biohacking pages, starting with Sauna: evidence summary.
Where is the infrared sauna evidence?
On Infrared sauna: evidence summary and the comparison with traditional sauna.
Is a sauna good for your heart?
Finnish observational studies link frequent use with lower risk, but that is an association, not proof. [2]
Are infrared saunas better than regular ones?
The reviews read here did not compare them directly. Research on infrared sauna centers on people with heart conditions. [4]
Can I drink alcohol before a sauna?
No. Alcohol raises the risk of low blood pressure, arrhythmia and sudden death. [1]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety First
Heat exposure can cause fainting, dehydration and, rarely, sudden death. A review of sauna research notes that alcohol during sauna bathing raises the risk of low blood pressure, arrhythmia and sudden death and should be avoided. [1] The same review lists unstable angina, recent heart attack and severe aortic stenosis as contraindications. [1] People with heart conditions, blood pressure problems, pregnancy or on blood pressure medicines should ask a clinician first. If someone collapses or has chest pain, call emergency services (911 in the US). This site gives no sauna temperatures or times.
References
- American Journal of Medicine (2001), health effects and risks of sauna bathing, review. PubMed record. Read 2026-10-22.
- JAMA Internal Medicine (2015), sauna bathing and fatal cardiovascular events in middle-aged Finnish men. PubMed record. Read 2026-10-22.
- Evidence-Based Complementary and Alternative Medicine (2018), health effects of dry sauna bathing, systematic review. PubMed record. Read 2026-10-22.
- Infrared sauna bathing and cardiac function, systematic review and meta-analysis (2018). PubMed record. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.