Can Sauna Bathing Lower Blood Pressure? What the Trials Show

High blood pressure is one of the biggest drivers of cardiovascular risk, and sauna bathing has a research base specifically looking at its effect on blood pressure — separate from the broader long-term heart-health cohort data.

What the research looked at

A crossover randomized trial in 16 patients with untreated hypertension compared sauna sessions alone, sauna sessions after exercise, and a no-sauna control condition, tracking 24-hour ambulatory blood pressure and cardiovascular hemodynamics. Separately, an 8-week, three-arm randomized controlled trial split 47 adults (average age 49) into exercise-plus-sauna, exercise-only, and control groups, measuring blood pressure, cardiorespiratory fitness, and cholesterol.

What they found

In the crossover trial, both sauna alone and post-exercise sauna produced measurable improvements in 24-hour blood pressure and reduced vascular resistance, with effects lasting up to 120 minutes after the heat exposure. In the 8-week trial, the exercise-plus-sauna group had significantly lower systolic blood pressure than exercise alone — 8.0 mmHg lower — plus a bigger improvement in cardiorespiratory fitness and a larger drop in total cholesterol (19 mg/dL, p=0.047) than exercise by itself.

What this means in practice

Two different trial designs point the same way: sauna use appears to lower blood pressure both immediately after a session and, combined with regular exercise, over a period of weeks. If you have hypertension, especially if it's untreated, talk to your doctor before starting regular sauna use — heat exposure interacts with some blood pressure medications and cardiovascular conditions.