Top 7 Health Benefits Of Saunas For Immunity, Heart Health & More

Sauna bathing has long been a staple in Finnish culture. Within the past few years, saunas have become a hot (pun intended) trend in other parts of the world too, thanks to their many well-being benefits. Intentional heat exposure seems to have a profound impact on cardiovascular and metabolic health—but what, exactly, is it about heat that's so good for us? And how can we best use it to our advantage without going too far?

While the jury’s still out on whether or not regular sauna use can lead to long-lasting weight loss on its own, it definitely can ramp up your metabolism to help you burn more calories. It’s believed to work by increasing your body temperature1, leading to increased cardiac output and a higher heart rate. This causes your body to work harder, resulting in a quicker metabolism.

Setor Kunutsor, M.D., Ph.D., an associate professor at the University of Leicester who has conducted extensive research on saunas, tells mindbodygreen that sauna use may be associated with several heart-healthy benefits, including a reduced risk of heart disease and hypertension (aka high blood pressure).

He explains that heat exposure works by easing inflammation3, reducing oxidative stress, and decreasing lipid and blood pressure levels. It might also help reduce stiffness in the arteries4 and improve the function of the cells that line the blood vessels.

Interestingly, one study published by Kunutsor and colleagues found that more frequent sauna use (4-7 times a week) was linked to a lower risk of fatal cardiovascular events (such as heart attack or stroke) in men and women.

Hitting the sauna regularly might help you live longer by reducing your risk of fatal cardiovascular events and stroke, according to longevity specialist Darshan Shah, M.D.

In fact, research shows that repeated sauna use helps optimize your body’s response to heat exposure6, thanks to a biological process known as hormesis. Hormesis is a short-term stressor that triggers an assortment of protective mechanisms to promote cell repair and protect against other stressors, which may lead to a longer lifespan.

According to one review, frequent sauna bathing may also support longevity7 by enhancing the effects of other beneficial lifestyle factors (such as physical activity) or offsetting the adverse effects of risk factors like high blood pressure or inflammation.

One study published in The Journal of the American Medical Association followed over 2,300 middle-aged Finnish men over an average of 20 years. Researchers found that increased frequency of sauna use was tied to a lower risk of premature death8, plus a decreased risk of sudden cardiac death, fatal coronary heart disease, and fatal cardiovascular disease.

Lots of people hop in the sauna right after hitting the gym, and for good reason. Heat exposure can help reduce cell damage10 and increase the expression of heat shock proteins, which boost protein synthesis and stimulate muscle growth.

Saunas can also improve circulation by increasing production of nitric oxide11 (a compound that dilates the blood vessels) to help accelerate post-workout recovery.

A recent 2023 study concluded that an infrared sauna session (more on this type of sauna below) could reduce muscle soreness12 and improve perceived recovery after resistance training. It might also increase blood volume, leading to enhanced endurance while you work out.

If you frequently find yourself feeling under the weather, making the sauna a regular part of your routine might help.

According to Kunutsor, not only can sauna sessions alleviate inflammation and increase immune function, but they may also protect against a slew of issues like asthma, pneumonia, and the common cold.

In addition to promoting the health of your body, promising research suggests that sauna bathing might even help keep your brain healthy too. Kunutsor tells mindbodygreen that it works by supporting neurogenesis6, or the formation of new neurons in the brain.

He notes that heat exposure can also increase the expression of brain-derived neurotrophic factor,16 a type of protein needed to maintain memory and learning. 

Taking time to relax in the sauna might also be beneficial for your mental well-being. Its positive psychological effects are thought to stem from a variety of factors1, including reduced stress levels and an increased release of endorphins, or feel-good hormones.

The first saunas were believed to be invented in Finland, where saunas have been a staple for over 2,000 years. Originally, sauna houses were made of logs and were heated using rocks with a fire. Unlike modern saunas, they had only a small hole in the wall rather than a chimney, meaning that they were often filled with smoke and ash.

These saunas use infrared energy to heat the body, without directly heating the air around you. Compared to traditional saunas, infrared saunas usually operate at a lower temperature. They have also not been as extensively studied.

For a more portable and budget-friendly sauna-like experience from the comfort of your own home, you can also try a sauna blanket. These blankets are similar to infrared saunas and emit infrared light to heat the body, though far less research has been done on them than on traditional saunas.

Portable saunas are also an option. These small enclosures are often equipped with a small chair so you can sit down during your session. These saunas use steam or infrared light for heat and tend to be a more affordable alternative to installing an entire sauna in your home.

These waterproof tracksuits are designed to help retain heat while you work out, which can help increase sweating. They might help you burn a few more calories while exercising. One study in active men and women showed that wearing a sauna suit enhanced calorie expenditure23 both during and after exercise and bumped up fat burning for up to an hour.

There’s definitely some overlap between saunas and steam rooms, as both involve exposure to heat and can increase your body’s temperature. However, there’s a key difference in terms of the temperature and humidity of each; steam rooms don’t get as hot and have a much higher degree of humidity, whereas saunas use dry heat to stimulate sweating.

Because both can bring your body into hormesis to spur cellular repair, steam rooms and saunas likely share a pretty similar set of benefits. However, saunas have been much more extensively studied for their potential health perks.

Prolonged sauna use can lead to overheating, dehydration, and in extreme cases, heat stroke. It can also cause damage to the tissues, which may lead to burns24 on parts of the body that are exposed. This makes adopting a safe, effective sauna protocol super important.

To start, enter your sauna hydrated and try drinking at least 2-4 glasses of water after getting out. Adjust your intake (and potentially add in some electrolytes) based on how much you sweat. You should also limit your sauna session to around 15-20 minutes and avoid alcohol before heat exposure, which can increase the risk of serious side effects.

Kunutsor recommends sticking to a temperature between 80-100°C (176-212°F), which is the sweet spot to ensure you’re getting the most bang for your buck with each sauna session, according to research.

As far as how long you should aim for, he notes that it can vary a bit based on your personal preferences and comfort level, but “the overall evidence suggests that reaping the optimal benefits from sauna sessions requires a frequency of 3-7 sessions per week, with each session lasting approximately 15-20 minutes.”

Hot-cold therapy can ramp up the possible health benefits of your next sauna session.

Hot-cold therapy involves following up your sauna session with a plunge into cold water, which can drive up adrenaline levels and relieve pain25. Cold exposure can also decrease levels of specific hormones, including cortisol26 (the body’s stress hormone), while activating brown fat, a type of fat that helps regulate your body temperature and metabolism.

Some proponents even claim that hot-cold therapy can increase levels of human growth hormone to boost muscle growth, though more research is needed.

If you’re interested in trying hot-cold therapy (also sometimes called contrast therapy), start by hitting the sauna for 15-20 minutes and following it up with a quick dip in an ice bath or cold plunge tub for 3-5 minutes. If you prefer, you can also start with a cold plunge to try a cold-hot-cold routine instead.

There’s no doubt that science backs up many of the purported benefits of saunas, like those listed above. However, some argue that evidence is lacking for a few of sauna's health claims, including its ability to detoxify the body or lead to long-lasting weight loss.

Furthermore, saunas may not be a good fit for everyone, including those with certain health conditions like heart disease or low blood pressure. Saunas can also cause a temporary reduction in sperm production1 and are not recommended for people who are pregnant or trying to become pregnant.

There is also the concern that some people might think of sauna bathing as a replacement for cardiovascular exercise. While the responses produced by an ordinary sauna bath correspond to those produced by moderate physical activities (such as walking), Kunutsor explains that sitting in the sauna shouldn’t replace regular physical activity.

The research on sauna's benefits for cardiovascular health, immunity, and brain function is very strong. While most studies on sauna use have not been very diverse (conducted on mostly Scandinavian populations), they've come to impressive conclusions. Some health experts now claim that if sauna were a pill, it would be a blockbuster drug—and we at mindbodygreen have to agree.

Taking an occasional sauna is a relaxing treat—but having a regular sauna routine will have a much greater impact on your health. Research suggests that using a sauna that's 80-100 degrees Celsius 2-3 times a week for 15-20 minutes at a time is ideal. To bump up the metabolic benefits, consider adding a cold plunge afterward.

Not everyone has access to saunas, of course, so we celebrate DIY methods and new products like blankets and portable saunas that are easier to set up at home. While they may not replicate all of the benefits of traditional saunas, they offer a solid dose of deliberate heat exposure.

While saunas mimic some elements of cardio activity (hence their heart health benefits), they can't replicate the other benefits of exercise like muscle and bone strengthening. Instead, think of sauna like the cherry on top of an already heart-healthy routine.

While sauna bathing is generally safe for most people in good health, Kunutsor notes that some might be better off skipping the sauna.

Specifically, saunas are not recommended for people who are ill or those who are pregnant or trying to become pregnant. It’s also a good idea to check in with a doctor if you have heart problems or orthostatic hypotension, as saunas can cause a drop in blood pressure levels.