Can You Use a Sauna With High Blood Pressure? What the Evidence Shows

Can You Use a Sauna With High Blood Pressure? What the Evidence Shows

Quick Answer

For most people with controlled, stable hypertension, regular sauna use is likely safe and may even modestly reduce blood pressure over time. The key word is controlled: those with severely elevated or uncontrolled blood pressure (typically defined as systolic >180 mmHg or diastolic >110 mmHg) should not use a sauna without medical clearance. Research, including large Finnish cohort studies, suggests that regular sauna bathing is associated with reduced cardiovascular mortality — even in those with hypertension — though this data comes from observational studies and cannot establish causation.

How Sauna Affects Blood Pressure

The acute blood pressure response to sauna use is nuanced and occurs in two phases. During the sauna session itself, heat causes peripheral vasodilation — blood vessels in the skin dilate to dissipate heat. This initially causes a mild reduction in diastolic blood pressure (the lower number) as peripheral resistance drops, while systolic blood pressure (the upper number) may rise modestly due to increased cardiac output compensating for the vasodilation.

The net effect on systemic blood pressure during a sauna session is relatively modest in healthy individuals. Heart rate increases significantly (to 100–150 bpm at typical Finnish sauna temperatures), and this cardiac response is part of what makes sauna use "exercise-like" — it provides cardiovascular conditioning without mechanical joint stress.

After the session, as the body cools, there is typically a period of reduced blood pressure — a response similar to post-exercise hypotension. This post-sauna blood pressure reduction is one of the mechanisms proposed to explain the long-term blood pressure benefits seen in regular sauna users.

These acute effects have been measured directly. In a 2018 study published in the Journal of Human Hypertension, 102 adults who each had at least one cardiovascular risk factor completed a single 30-minute session at 73°C. Average systolic blood pressure fell from 137 to 130 mmHg and average diastolic from 82 to 75 mmHg — roughly 7 mmHg on each measure — and systolic pressure was still below its pre-sauna level after 30 minutes of recovery. This was a before-and-after study without a comparison group, so it shows what happens around a sauna session rather than proving the sauna alone caused every part of the change. It is also why many people feel relaxed and a little "loose" after a session — and why standing up too quickly afterwards can occasionally cause a head-rush.

Research on Sauna and Hypertension

The most compelling data comes from the Kuopio Ischaemic Heart Disease Risk Factor Study, a large Finnish cohort study following middle-aged men for more than two decades. In a prospective analysis of 1,621 men who did not have hypertension at the start, men who used a sauna 4–7 times per week were about half as likely to be diagnosed with hypertension over a median 24.7 years of follow-up as men using a sauna once a week (hazard ratio 0.54, 95% CI 0.32–0.91). Two important caveats travel with that number: it is observational, so it cannot establish cause, and the participants were middle-aged Finnish men, which limits how far the finding stretches to other populations. The same cohort also showed substantially lower cardiovascular mortality among frequent sauna users.

A 2018 systematic review published in Mayo Clinic Proceedings analysed sauna bathing and cardiovascular health across multiple studies. The review found consistent associations between regular sauna use and lower blood pressure, improved arterial compliance, and reduced cardiovascular risk — though the authors noted most data is observational.

Separately, a small controlled trial gives a hint at the mechanism. Twenty young, sedentary adults were assigned to either eight weeks of repeated hot-water immersion or a thermoneutral sham. The heat group showed improved flow-mediated dilatation, reduced arterial stiffness and a fall in mean arterial and diastolic blood pressure, while the sham group showed no change. Worth noting: that trial used hot-water immersion rather than a sauna, and involved only ten people per group — so it is a useful signal about passive heat generally, not direct proof about saunas. The proposed mechanism is that repeatedly dilating your vessels and gently challenging your cardiovascular system may help keep it supple and responsive.

Multiple short-term interventional studies have demonstrated that a 2–3 week course of regular sauna sessions produces measurable reductions in blood pressure in hypertensive patients, with effects comparable to some antihypertensive medications over that short time period. Taken together, the effect appears real but modest, and it rests largely on observational and small-trial evidence — think of a sauna as one helpful contributor among many, working alongside exercise, a good diet and a healthy weight, not a stand-in for them.

Who Should Avoid Sauna

  • Severe or uncontrolled hypertension (>180/110 mmHg): At these blood pressure levels, the acute cardiovascular stress of sauna use creates genuine risk. The initial systolic blood pressure rise can push already dangerously elevated pressures into stroke territory. Seek medical clearance and blood pressure control before attempting sauna use.
  • Recent hypertensive emergency: Anyone who has had a hypertensive crisis — extremely high blood pressure causing end-organ damage — should not use a sauna until blood pressure is fully controlled and medical clearance is obtained.
  • Undiagnosed or undertreated hypertension: If you don't know your blood pressure or know it's elevated but aren't receiving treatment, measure it before using a sauna. Blood pressure monitors are widely available and inexpensive.

Guidelines for Those With Controlled Hypertension

  • Start gradually: Begin with shorter sessions (5–10 minutes) at moderate temperatures (70–80°C) rather than full-duration high-temperature sessions. Give your cardiovascular system time to adapt.
  • Measure your blood pressure: Check your blood pressure before and after your first several sauna sessions to understand your individual response. Pre-session readings above 160/100 should prompt delay of that session.
  • Avoid extreme temperatures: The hottest areas of traditional Finnish saunas (top bench, close to the heater) can reach 110–120°C. For those with hypertension, staying at lower bench positions (80–90°C) reduces cardiovascular demand.
  • Hydrate well: Dehydration during sauna use can raise blood pressure. Drink 500ml of water before your session.
  • Never combine sauna with alcohol: Blood pressure drops during and shortly after a session, and alcohol compounds that drop — particularly if you also take blood-pressure-lowering medication. The combination increases the risk of light-headedness, fainting and falls. Save any drink for well after you have cooled down and rehydrated.
  • Exit slowly: Orthostatic hypotension — a sudden drop in blood pressure on standing — is more pronounced after heat exposure. Rise from sitting to standing gradually to avoid dizziness.
  • Avoid cold immediately after: For those with hypertension, rapid transition to cold water (ice bath) after sauna is higher risk than ending the session with gradual cooling. Avoid sudden cold plunges.
  • Never sauna when blood pressure is acutely elevated: If you're experiencing symptoms of high blood pressure (headache, visual changes, chest pain), skip the sauna that day.

Blood Pressure Medications and Sauna

If you're taking antihypertensive medications, be aware of these specific considerations:

  • Beta-blockers: These medications blunt the heart rate response to heat. Your heart rate will not increase as much during sauna use, which alters the normal cardiovascular adaptation. You may also experience reduced ability to dissipate heat. Monitor how you feel more carefully than unmedicated users.
  • Diuretics: Already increase fluid and electrolyte loss. Combined with sauna-induced sweating, dehydration risk is substantially elevated. Increase your pre-sauna hydration and consider electrolyte supplementation.
  • ACE inhibitors and ARBs: May enhance the vasodilatory response to heat, potentially causing more pronounced post-sauna blood pressure reduction (hypotension). Rise slowly and avoid prolonged standing immediately after the session.
  • Calcium channel blockers: Can enhance vasodilation in heat and may cause more pronounced reductions in blood pressure. Same precautions as ACE inhibitors apply.

Always discuss sauna use with your prescribing physician if you're on blood pressure medications, particularly if you're on multiple medications or experiencing symptoms.

How to Monitor Yourself

For those with hypertension new to sauna use:

  • Measure blood pressure before the session. Do not use the sauna if systolic is above 160 mmHg.
  • Note any symptoms during the session: unusual shortness of breath, chest pain, visual changes, severe headache, or confusion are reasons to exit immediately.
  • Measure blood pressure 30 minutes after the session. A reading below your pre-session level is typical and expected. A significantly elevated post-session reading (>20 mmHg above your usual baseline) warrants discussion with your doctor.
  • Keep a simple log of pre- and post-session readings for the first month of use.

Frequently Asked Questions

What blood pressure level is too high for sauna use?
Most exercise and cardiac rehabilitation guidelines suggest avoiding exercise at blood pressure above 180/110 mmHg. The same principle applies to sauna. Some cardiologists use 160/100 as a more conservative threshold for sauna avoidance.

Can sauna replace blood pressure medications?
No. While evidence suggests regular sauna use can modestly reduce blood pressure, this effect is not a substitute for prescribed medication. Continue your medications as prescribed and discuss sauna as an adjunct intervention with your doctor.

Why do I feel dizzy after a sauna?
Your blood pressure is temporarily lower and blood has pooled near the skin to shed heat. Standing up slowly, cooling down gradually and rehydrating usually resolves it. If dizziness is severe or persistent, see your doctor.

Is infrared sauna safer than traditional sauna for hypertension?
Infrared saunas operate at lower temperatures (45–60°C vs 80–100°C) and produce a somewhat milder cardiovascular response. For those with hypertension who want to start sauna therapy, infrared sauna may be a more conservative entry point, though the evidence base is smaller than for traditional Finnish sauna.

References

  • Zaccardi F, Laukkanen T, Willeit P, Kunutsor SK, Kauhanen J. Sauna bathing and incident hypertension: a prospective cohort study. Am J Hypertens. 2017;30(11):1120–1125. PubMed: 28633297
  • Laukkanen JA, Laukkanen T, Kunutsor SK. Cardiovascular and other health benefits of sauna bathing: a review of the evidence. Mayo Clin Proc. 2018;93(8):1111–1121. PubMed: 30077204
  • Laukkanen T, Kunutsor SK, Zaccardi F, Lee E, Willeit P, Khan H, Laukkanen JA. Acute effects of sauna bathing on cardiovascular function. J Hum Hypertens. 2018;32(2):129–138. PubMed: 29269746
  • Brunt VE, Howard MJ, Francisco MA, Ely BR, Minson CT. Passive heat therapy improves endothelial function, arterial stiffness and blood pressure in sedentary humans. J Physiol. 2016;594(18):5329–5342. PubMed: 27270841
  • Laukkanen T, Khan H, Zaccardi F, Laukkanen JA. Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Intern Med. 2015;175(4):542–548. PubMed: 25705824
Back to blog