The wellness world is always chasing the next breakthrough. A newer device, a more complicated protocol, another habit positioned as the missing piece of the longevity puzzle.
And yet, researchers and physicians keep returning to one of the oldest wellness practices around: sitting in a very hot room.
Sauna has become a recurring subject for experts including Dr. Rhonda Patrick, Dr. Andrew Huberman, Dr. Susanna Søberg, and Dr. Stacy Sims. Their areas of expertise differ, but the reasons for their interest tend to overlap. Regular heat exposure may support cardiovascular health, recovery, stress resilience, and several of the systems involved in healthy aging.
What makes sauna particularly compelling is that a growing body of research is beginning to explain why humans may have continued seeking out intentional heat for so long.
Sauna is not a shortcut to longevity or a replacement for exercise, sleep, or a nourishing diet. But it may be one of the simplest ways to give the body a manageable challenge, then allow it to recover.
Your Heart Is Working, Even While You Sit
A sauna session may feel passive, but your body is doing plenty behind the scenes. As you heat up, your blood vessels widen, circulation increases, and your heart rate rises to help regulate your temperature.
This does not mean sauna replaces cardio. You are not building muscle, strengthening your bones, or improving endurance in the same way you would during a workout. Still, the cardiovascular response is one reason researchers have become so interested in regular sauna use.
Dr. Rhonda Patrick often points to Finnish research linking frequent sauna bathing with lower rates of cardiovascular and all cause mortality. In one of the best known studies, men who used a sauna four to seven times a week had a lower risk of fatal cardiovascular events than those who used one once weekly.
Other research involving both men and women found that more frequent sauna use was associated with a lower risk of cardiovascular mortality. Regular sauna bathing has also been linked with a lower risk of developing high blood pressure.
These studies are observational, so they cannot prove sauna caused the results. Still, the findings are consistent enough to explain why heat exposure keeps showing up in conversations around heart health and longevity.
The Heat Is Part of the Point
Sauna gives the body a manageable amount of stress. This is often called hormesis, which is the idea that a small challenge can help the body adapt and become more resilient.
Exercise works in a similar way. You stress the body, recover, and gradually become better equipped to handle that stress again.
Dr. Andrew Huberman and Dr. Susanna Søberg have both spoken about deliberate heat exposure through this lens. Researchers are especially interested in heat shock proteins, which help cells respond to stress and maintain normal cellular function.
One study found that sauna exposure affected genes involved in the heat shock response, though scientists are still learning what that may mean for long term health.
The practical takeaway is that hotter is not always better. A sauna should feel challenging, but it should not leave you dizzy, nauseated, or completely drained. You are not getting extra benefits for staying in longer than your body wants you to.
Sauna May Matter for Brain Health Too
Some of the most interesting sauna research involves the brain.
A long term Finnish study found that men who used a sauna frequently had a lower observed risk of dementia and Alzheimer’s disease. Another study involving nearly 14,000 people also found an association between regular sauna use and a lower risk of dementia.This does not mean sauna prevents dementia. Researchers are still trying to understand why the relationship exists.
One possible explanation is the connection between heart health and brain health. The brain depends on healthy blood vessels and steady blood flow, so habits that support the cardiovascular system may also matter for cognitive health over time.
The science is still developing, but it suggests sauna may offer more than a temporary sense of relaxation after a workout.
Traditional Sauna or Infrared Sauna?
Most of the longevity research comes from traditional Finnish sauna, which heats the air around you and usually operates at a higher temperature.
Infrared sauna works differently by using infrared energy to warm the body while the surrounding air stays cooler. Many people find it easier to tolerate, especially if traditional sauna feels overwhelming.
Both can raise body temperature and heart rate, but they have not been studied equally. A small study found that infrared sauna created measurable cardiovascular and thermal responses in healthy women. Early research has also looked at infrared sauna for muscle soreness and exercise recovery.
Traditional sauna still has the strongest longevity data behind it. Infrared may still be a good option for relaxation, recovery, and regular heat exposure, particularly if the lower temperature means you will actually use it.
Recovery May Be the Benefit You Notice First
Sauna can feel especially good after a hard workout or a long, stressful day. Dr. Stacy Sims often talks about how important recovery becomes for maintaining strength, performance, and consistency as we age.
Research in this area is still limited, but studies have explored infrared sauna for muscle soreness and neuromuscular recovery. Traditional sauna research has also found changes in heart rate variability that may reflect greater parasympathetic activity during recovery.
In everyday terms, sauna may help the body shift into a calmer state. There is also something to be said for spending fifteen or twenty minutes without messages, notifications, or another screen demanding your attention.
In one international survey, more than 80 percent of sauna users reported perceived sleep benefits. That does not prove sauna improves sleep, but it lines up with why so many people use it as a way to wind down.
How Often Should You Use a Sauna?
The Finnish research found the strongest associations among men who used a sauna four to seven times per week, but that does not mean everyone needs to start going daily. These were people who were already accustomed to regular sauna bathing. The study was not prescribing the same routine to everyone.
For someone new to sauna, one or two shorter sessions a week may be a more realistic place to start. From there, you can adjust based on how your body feels.
Hydration matters, particularly if you are using a sauna after exercise. Anyone who is pregnant, has cardiovascular or blood pressure concerns, frequently feels dizzy or faint, or takes medications that affect hydration or temperature regulation should speak with a healthcare professional first.
The goal is simple: leave feeling better than when you went in.