The most important things to know
- Sauna can lower blood pressure temporarily during and just after a heat session, but it is not a treatment for high blood pressure.
- Research on frequent sauna visits shows promising associations, but cannot prove that sauna prevents cardiovascular disease.
- Start gently, drink fluids, and leave the sauna if you feel dizzy, have chest pressure, or feel unwell.
- Talk to your doctor before using the sauna if you have untreated high blood pressure, heart disease, or take medication that affects circulation.
Sauna and blood pressure: the short answer
Can sauna lower blood pressure? Yes, heat in the sauna can cause the blood vessels in the skin to dilate, so blood pressure often falls during and immediately after a session. This is a physiological response to heat, not the same as a treatment for high blood pressure.
For most healthy adults, a calm sauna visit can be an enjoyable part of daily life. If you live with high blood pressure, heart disease, or take circulation-affecting medication, the question is more personal. It is important to understand the research, its limitations, and the signals your body gives.
This guide brings together what we know about sauna and blood pressure, without presenting heat as a miracle cure. It covers classic sauna and saunagus (a guided sauna ritual), where a gusmester works with heat, steam and calm pauses.
What happens in the body when you get warm?
In the sauna your skin temperature rises, you begin to sweat, and the heart works faster to help the body shed heat. At the same time, blood vessels expand, especially near the skin. This reduces resistance in the circulation and can help explain why many people have lower blood pressure after heat exposure.
That does not mean the body is under the same load as during exercise. But heat activates several of the same regulatory mechanisms, including heart rate, blood flow and temperature control. That is why the experience also varies from person to person, depending on fluid balance, sleep, medications, daily condition and how accustomed you are to heat.
With [saunagus](/viden/hvad-er-saunagus), steam comes in waves when the gusmester pours water on the stones and distributes the warm air with a towel. The experience can feel more intense than a quiet sauna visit, even though the load on an individual cannot be read from the temperature alone. Pauses and the option to step out are therefore a natural part of a good ritual.
What does the research show about blood pressure?
A clinical study from 2018 examined 102 adults with at least one cardiovascular risk factor. Participants sat for 30 minutes in a sauna at 73 °C with 10 to 20 percent humidity. On average, systolic blood pressure fell from 137 to 130 mmHg and diastolic from 82 to 75 mmHg immediately after the session. Systolic blood pressure was still lower after 30 minutes of calm recovery [Laukkanen et al., 2018](https://pubmed.ncbi.nlm.nih.gov/29269746/).
It is an interesting snapshot, but not a treatment protocol. The study looked at a single session and did not include a control group without sauna. The result therefore cannot tell us whether a specific sauna pattern leads to a lasting lower blood pressure in daily life.
A larger Finnish observational study followed 1,621 men without high blood pressure at baseline for a median of 24.7 years. Compared with one sauna visit per week, more frequent sauna was associated with lower incidence of high blood pressure. For the group with four to seven sauna visits per week, the adjusted hazard ratio was 0.53. This is an association, not proof of cause and effect, because sauna habits can also be related to lifestyle, overall health and social factors [Zaccardi et al., 2017](https://pubmed.ncbi.nlm.nih.gov/28633297/).
A systematic review and meta-analysis of various forms of heat therapy found on average small reductions in systolic and diastolic blood pressure. However, the researchers combined sauna and other heat protocols with different durations and participant groups. The result is therefore promising, but cannot be translated into a recommendation that everyone should follow the same sauna routine [Pizzey et al., 2021](https://doi.org/10.1113/EP089424).
| What the research can say | What it cannot say |
|---|---|
| Blood pressure can fall briefly after heat exposure | That sauna can replace doctor-prescribed treatment |
| Frequent Finnish sauna visits are associated with lower risk of later high blood pressure | That sauna alone prevents high blood pressure for everyone |
| Heat can affect blood vessels and the circulatory system | Which temperature, duration or frequency is right for you |
| Regular sauna can be part of a healthy lifestyle | That results from a Finnish dry sauna apply equally to steam baths, infrared saunas and ice baths |
Sauna is a supplement, not a treatment
If you have been diagnosed with high blood pressure, it is still your doctor's plan, any medications, exercise, diet, sleep and smoking cessation that are the documented measures. A sauna visit can be a wellness ritual alongside these habits. It should not be used to delay measurement, evaluation or treatment.
It is also important to distinguish between a measured drop immediately after heat and your usual blood pressure. A lower number in the changing room does not alone tell you how blood pressure is the rest of the day. If you have a blood pressure monitor at home, follow the measurement routine your doctor or pharmacy has recommended, rather than measuring directly after sauna.
For many, the most realistic benefit is that the ritual creates space for calm, presence and a break from screens. That can support a healthy routine, but health claims must still be weighed against the concrete evidence. Also read our guide to [sauna and sleep](/viden/sauna-og-sovn) if you want to understand how heat and recovery can be related without confusing experience with treatment.
How to use sauna with care
A good sauna habit starts with choosing a level your body can handle. You do not need to endure discomfort to have a meaningful experience. Step out before you feel unwell, and give your body time to calm down between heat rounds.
- Start with short sessions, especially if you are new to sauna or returning after a break.
- Drink water before and after. Heat and sweating increase the need for fluids.
- Avoid alcohol before and immediately after sauna, as the combination can increase the risk of dehydration and low blood pressure.
- Rise slowly, and sit for a moment before moving on. Heat can make some people feel dizzy.
- Prefer gradual cooling rather than forcing the body into a very cold dip. This is especially important with known cardiovascular disease.
A calm session also gives a better framework for noticing how you feel. Heat should feel safe, not like a performance. If you experience dizziness, nausea, palpitations, shortness of breath or chest pressure, leave the sauna and seek medical evaluation for persistent or serious symptoms.
Who should talk to their doctor first?
Hjerteforeningen recommends caution for people with untreated high blood pressure, serious rhythm disorders, severe heart failure, recent myocardial infarction, angina and untreated cardiovascular disease. In these cases, sauna should be discussed with your own doctor. They also note that people taking diuretics may be more prone to dehydration [Hjerteforeningen, 2024](https://hjerteforeningen.dk/artikler/alle-artikler/vinter-wellness/).
Brown University Health similarly points out that unstable heart disease, recent heart attack, uncontrolled high blood pressure, decompensated heart failure and severe aortic stenosis require special caution. For stable heart patients, sauna may be possible in some cases, but it is not a general free pass. The right approach depends on diagnosis, symptoms and medications [Brown University Health, 2023](https://www.brownhealth.org/be-well/saunas-and-your-heart-it-safe-use-sauna-if-you-have-heart-disease).
If you are in doubt, have the conversation with your doctor before your next visit. This also applies if you combine sauna with cold therapy. The contrast between heat and cold can feel invigorating, but is a clear circulatory load for some. Our introduction to [cold therapy and ice baths](/viden/kuldeterapi-og-isbad) can help you start with respect for the body.
A warm ritual that respects the body
Sauna and saunagus can create a strong sense of calm, warmth and community. Research shows that heat can affect blood pressure acutely and that frequent Finnish sauna visits are associated with interesting health outcomes. It does not show that sauna can stand alone as a treatment.
Use sauna as a ritual, not as a prescription. Choose the heat, duration and pauses that feel safe for you. For healthy adults, a good visit is often about slowing down. For anyone with blood pressure or heart disease, it is also about listening to the body and including medical advice in the decision.
Sources
- [Laukkanen et al., Acute effects of sauna bathing on cardiovascular function, 2018](https://pubmed.ncbi.nlm.nih.gov/29269746/)
- [Zaccardi et al., Sauna Bathing and Incident Hypertension: A Prospective Cohort Study, 2017](https://pubmed.ncbi.nlm.nih.gov/28633297/)
- [Pizzey et al., The effect of heat therapy on blood pressure and peripheral vascular function: A systematic review and meta-analysis, 2021](https://doi.org/10.1113/EP089424)
- [Hjerteforeningen, Sauna, damp og vinterbad: Tips og råd til wellness i den kolde tid, 2024](https://hjerteforeningen.dk/artikler/alle-artikler/vinter-wellness/)
- [Brown University Health, Saunas and Your Heart: Is it Safe to Use a Sauna If You Have Heart Disease?, 2023](https://www.brownhealth.org/be-well/saunas-and-your-heart-it-safe-use-sauna-if-you-have-heart-disease)
