# Sauna Benefits: What the Research Actually Shows

Source: https://www.mars-sauna-room.com/guides/sauna-benefits/

Published 2026-09-22, updated 2026-10-20.

The best-supported sauna benefits are cardiovascular: large Finnish cohort studies link frequent sauna use (4-7 times a week) with lower rates of fatal heart disease, stroke and high blood pressure. Smaller studies point to relaxation, better sleep and pain relief, but most of the evidence is observational, so a sauna is a healthy habit to add to exercise and good sleep, not a treatment.

This article is general information, not medical advice. People who are pregnant, have heart disease, low or high blood pressure or other conditions should talk to a doctor before using a sauna or cold plunge.

## What does a sauna do to your body?

A traditional Finnish sauna heats the air to roughly 80-100 °C (176-212 °F) at 10-20% relative humidity, according to a [2018 review in Mayo Clinic Proceedings](https://pubmed.ncbi.nlm.nih.gov/30077204/). An infrared sauna runs cooler, around 43-57 °C (110-135 °F) per [Cleveland Clinic](https://health.clevelandclinic.org/sauna-benefits), and warms the body more directly with infrared radiation.

Within minutes, skin temperature climbs toward 40 °C (104 °F) and core temperature rises by about 1-2 °C. The body responds much as it does to moderate exercise:

- Heart rate rises, often to 100-150 beats per minute.
- Blood vessels near the skin widen, and blood flow shifts toward the skin to shed heat.
- Sweating starts, with an adult losing on the order of 0.5 kg (about 1 lb) of fluid in a short session.
- Blood pressure often drops slightly during and after the session as vessels relax.

That "passive cardio" response is the main reason researchers think sauna therapy may benefit the heart and blood vessels.

## What are the benefits of a sauna? The evidence at a glance

Not all claims carry the same weight. The table below sorts common sauna health benefits by the strength of the evidence behind them.

| Claimed benefit | Main evidence | Study type | Strength |
|---|---|---|---|
| Lower risk of fatal heart disease | 2,315 Finnish men, 20.7-year follow-up (2015) | Observational cohort | Moderate |
| Lower risk of high blood pressure | 1,621 Finnish men, 24.7-year follow-up (2017) | Observational cohort | Moderate |
| Lower stroke risk | 1,628 men and women, 15-year follow-up (2018) | Observational cohort | Moderate |
| Lower dementia risk | 2,315 Finnish men, about 20-year follow-up (2017) | Observational cohort | Limited |
| Relief of pain and stiffness | Small clinical trials in rheumatic conditions and back pain | Small trials | Limited |
| Mood, stress and sleep | Short trials and surveys | Mixed | Limited |
| "Detox" or fat loss | Little or none | n/a | Not supported |

## Is sauna use good for your heart?

The headline study is a [2015 paper in JAMA Internal Medicine](https://pubmed.ncbi.nlm.nih.gov/25705824/) that followed 2,315 men aged 42-60 in eastern Finland for a median of 20.7 years. Compared with men who used a sauna once a week, those who went 4-7 times a week had a 63% lower risk of sudden cardiac death and a 40% lower risk of death from any cause. Sessions longer than 19 minutes were linked to lower sudden cardiac death risk than sessions under 11 minutes.

The authors were clear that this was an observational study. Men who sauna daily may also differ in income, fitness or social life, and the researchers adjusted for many such factors but could not rule them all out.

### Sauna and blood pressure

Blood pressure is one of the most searched topics, from "can a sauna lower blood pressure" to "sauna and hypertension." A [2017 study in the American Journal of Hypertension](https://research-information.bris.ac.uk/en/publications/sauna-bathing-and-incident-hypertension-a-prospective-cohort-stud/) followed 1,621 Finnish men without hypertension for a median of 24.7 years. Men using a sauna 4-7 times a week had roughly half the risk of developing high blood pressure (hazard ratio 0.53) compared with once-weekly users. The 2-3 times a week group showed a smaller, statistically uncertain reduction.

Is a sauna good for high blood pressure that already exists? Short-term studies show blood pressure dips after a session, but people with uncontrolled hypertension, or anyone taking blood pressure medication, should get medical advice first. Some medications reduce the body's ability to handle heat or cause dizziness when standing up.

### Stroke and circulation

A 2018 study of 1,628 men and women aged 53-74 in Finland, summarized by the [University of Eastern Finland](https://www.uef.fi/en/article/frequent-sauna-bathing-reduces-risk-of-stroke), found that people who used a sauna 4-7 times a week had a 61% lower stroke risk than once-weekly users over 15 years. Because it included women, this is one of the more useful studies for questions about sauna benefits for women.

## Does a sauna help with inflammation and pain?

The [Mayo Clinic Proceedings review](https://pubmed.ncbi.nlm.nih.gov/30077204/) reported that frequent sauna bathing has been associated with lower levels of C-reactive protein, a blood marker of systemic inflammation. Heat also relaxes muscles and can ease stiffness.

A [2018 systematic review by Hussain and Cohen](https://pmc.ncbi.nlm.nih.gov/articles/PMC5941775/) of clinical studies on regular dry sauna bathing found some evidence of benefit for conditions such as rheumatic disease and chronic pain, with mostly mild side effects. Most trials were small and short, so "does a sauna reduce inflammation" has a cautious answer: possibly, as part of broader care.

## Can a sauna help with stress, anxiety and sleep?

Many people use a sauna for stress relief, and the warmth and quiet are relaxing in themselves. Evidence for clinical effects is thinner.

- A small randomized, sham-controlled trial published in [JAMA Psychiatry in 2016](https://pubmed.ncbi.nlm.nih.gov/27172277/) found that one session of medical whole-body hyperthermia reduced depression scores in adults with major depressive disorder for several weeks. It used a clinical device, not a home sauna.
- [Cleveland Clinic](https://health.clevelandclinic.org/sauna-benefits) notes that sauna use may ease anxiety and support sleep, while stating that the mechanisms are unclear.
- Sauna for sleep is a common reason for evening sessions. The drop in body temperature after leaving a hot room mirrors the natural cooling that comes before sleep, which may explain why many users report sleeping better.

## Does a sauna protect the brain?

A [2017 study in Age and Ageing](https://pubmed.ncbi.nlm.nih.gov/27932366/) of the same 2,315 Finnish men found that those using a sauna 4-7 times a week had about a 66% lower risk of dementia and a 65% lower risk of Alzheimer's disease than once-weekly users. This is interesting but early, and it has not been tested in randomized trials.

## Sauna benefits for men and women

The physiological effects are much the same for both sexes, but there are a few specific points:

- **Men:** Testicular heat can temporarily reduce sperm production. Cleveland Clinic advises men concerned about fertility to talk to a doctor; the effect is thought to reverse after stopping regular use.
- **Women:** Pregnant women, or those trying to conceive, should check with a healthcare provider before using a sauna, because raised core temperature is a concern in pregnancy.
- **Both:** Most cardiovascular data come from middle-aged Finns, so results may not transfer exactly to other populations.

## Sauna benefits and disadvantages: what are the risks?

A balanced look at the pros and cons of a sauna has to include the downsides. Cleveland Clinic identifies dehydration as one of the biggest risks. The most common negative effects of a sauna are:

- Dehydration and headache
- Dizziness or fainting, especially when standing up quickly
- Overheating if sessions run too long
- Burns from touching a hot stove or metal fittings

A [2008 analysis of sauna deaths in Finland](https://pubmed.ncbi.nlm.nih.gov/18471223/) in the Journal of Forensic Sciences found that alcohol was a frequent factor. Cleveland Clinic advises avoiding the sauna after drinking, and after a recent heart attack or stroke.

### Safe sauna checklist

1. Drink a glass or two of water before and after your session.
2. Skip alcohol before and during sauna use.
3. Start with 5-10 minutes; most people settle at 15-20 minutes.
4. Leave immediately if you feel dizzy, nauseous, short of breath or unwell.
5. Stand up slowly and cool down gradually.
6. Ask a doctor first if you are pregnant, over 65, under 16, take medication, or have heart, blood pressure or neurological conditions.

For timing details, see [how long to sit in a sauna](/guides/how-long-to-sit-in-sauna/) and our [sauna temperature guide](/guides/sauna-temperature/).

## Do infrared saunas have the same benefits?

Most of the long-term research used traditional Finnish saunas. [Mayo Clinic](https://www.mayoclinic.org/healthy-lifestyle/consumer-health/expert-answers/infrared-sauna/faq-20057954) notes that infrared saunas produce similar responses, such as heavy sweating and a faster heart rate, at lower air temperatures, and that no harmful effects have been reported. Whether a daily 15 minutes in an infrared sauna gives the same long-term results as a Finnish sauna has not been studied directly. Our article on [infrared sauna benefits](/guides/infrared-sauna-benefits/) covers that research separately.

What about sweating out toxins? Claims that a sauna "detoxes" the body are not supported by good evidence; the liver and kidneys do that work. See [do saunas detox your body](/guides/sauna-detox/) for the details.

## Choosing a sauna for regular use

Because the benefits in studies came from frequent use, convenience matters. A home sauna that you will actually use 3-4 times a week is likely worth more than an occasional spa visit. Options range from compact [far infrared saunas](/saunas/far-infrared-saunas/) that run at 18-65 °C (64-149 °F) to [traditional stove saunas](/saunas/traditional-steam-saunas/) with electric heaters of roughly 3.5-6 kW that reach Finnish-style temperatures.

Mars Sauna builds both types in Canadian hemlock and western red cedar, in 110-120V and 220-240V versions. Retailers, gyms and spas looking to stock or install saunas can [request a quote](/contact/).

## Key takeaways

- The strongest sauna benefits are cardiovascular: Finnish cohorts link 4-7 sessions a week with lower fatal heart disease, stroke and hypertension risk.
- These are observational studies of mostly middle-aged men, so they show association, not proven cause.
- Evidence for inflammation, pain, mood and sleep benefits is promising but limited to small or short studies.
- "Detox" and fat-loss claims are not supported by good evidence.
- Hydrate, avoid alcohol, keep sessions to about 15-20 minutes and get medical advice if you have heart or blood pressure conditions or are pregnant.

## FAQ
### Are saunas good for you?
For most healthy adults, regular sauna use appears to be safe and is linked with better cardiovascular health. Long-term Finnish studies found that people who used a sauna 4-7 times a week had lower rates of fatal heart disease, stroke and hypertension than once-a-week users. These are observational findings, so they show association rather than proof of cause.

### Can a sauna lower blood pressure?
Sauna use may help lower blood pressure, but the evidence is modest. A 2017 study of 1,621 Finnish men found that 4-7 sessions a week were associated with about half the risk of developing hypertension over 24.7 years compared with one session a week. Blood pressure also drops briefly after a session. People taking blood pressure medication should ask their doctor first.

### Does a sauna help with inflammation?
Possibly. Observational research from Finland has linked frequent sauna use with lower levels of C-reactive protein, a blood marker of inflammation, and small clinical studies report less pain and stiffness in some rheumatic conditions. The evidence is early, so a sauna should be seen as a complement to, not a replacement for, medical treatment of inflammatory disease.

### What are the side effects of a sauna?
The most common sauna side effects are dehydration, dizziness or lightheadedness when standing up, and overheating. Serious events are rare in healthy adults but are more likely when sauna use is combined with alcohol, long sessions or unstable heart disease. Drinking water, keeping sessions to about 15-20 minutes and leaving if you feel unwell reduce the risk.

### Are sauna benefits different for women and men?
The core cardiovascular and relaxation effects appear similar, but much of the early research studied only middle-aged men. A 2018 Finnish study that included women found frequent sauna use was linked to lower stroke risk in both sexes. Pregnant women should talk to a doctor before using a sauna, and men concerned about fertility should note that heat can temporarily affect sperm production.

### How long should you stay in a sauna to get benefits?
Most research on sauna benefits involved sessions of roughly 5-20 minutes at 80-100 °C (176-212 °F), several times a week. In the 2015 Finnish study, sessions longer than 19 minutes were associated with lower sudden cardiac death risk than sessions under 11 minutes. Beginners should start with 5-10 minutes and build up gradually.


## Sources
- [Laukkanen et al. (2015) Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine](https://pubmed.ncbi.nlm.nih.gov/25705824/)
- [Laukkanen et al. (2018) Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence. Mayo Clinic Proceedings](https://pubmed.ncbi.nlm.nih.gov/30077204/)
- [Zaccardi et al. (2017) Sauna Bathing and Incident Hypertension: A Prospective Cohort Study. American Journal of Hypertension](https://research-information.bris.ac.uk/en/publications/sauna-bathing-and-incident-hypertension-a-prospective-cohort-stud/)
- [Laukkanen et al. (2017) Sauna bathing is inversely associated with dementia and Alzheimer's disease in middle-aged Finnish men. Age and Ageing](https://pubmed.ncbi.nlm.nih.gov/27932366/)
- [University of Eastern Finland (2018): Frequent sauna bathing reduces risk of stroke](https://www.uef.fi/en/article/frequent-sauna-bathing-reduces-risk-of-stroke)
- [Hussain and Cohen (2018) Clinical Effects of Regular Dry Sauna Bathing: A Systematic Review](https://pmc.ncbi.nlm.nih.gov/articles/PMC5941775/)
- [Janssen et al. (2016) Whole-Body Hyperthermia for the Treatment of Major Depressive Disorder: A Randomized Clinical Trial. JAMA Psychiatry](https://pubmed.ncbi.nlm.nih.gov/27172277/)
- [Cleveland Clinic: Sauna benefits](https://health.clevelandclinic.org/sauna-benefits)
- [Mayo Clinic: Do infrared saunas have any health benefits?](https://www.mayoclinic.org/healthy-lifestyle/consumer-health/expert-answers/infrared-sauna/faq-20057954)
- [Kenttämies and Karkola (2008) Death in sauna. Journal of Forensic Sciences](https://pubmed.ncbi.nlm.nih.gov/18471223/)