Yes, and the evidence goes well beyond simple relaxation. Multiple studies now link regular sauna use to measurably lower rates of depression and better overall mood, with plausible biological reasons involving heat shock proteins, endocannabinoid release, and changes in brain blood flow.
Short answer: yes, and the research goes way beyond “sauna helps you relax.”
Over the last five years, studies have linked regular sauna use to measurable drops in depression risk, lower rates of psychotic disorders, and better subjective well-being. The mechanisms—heat shock proteins, neurotransmitter regulation, changes in brain blood flow—are getting clearer.
Here's what the science actually says.
What the recent studies found
Sauna frequency and depression risk
The most cited data comes from the Kuopio Ischemic Heart Disease study, a Finnish cohort tracking over 2,300 middle-aged men since the 1980s. A 2018 analysis found that men who used a sauna 2 to 3 times per week had a 27% lower risk of developing depression compared to once-a-week users. Men who saunad 4 to 7 times per week had a 77% lower risk.
Those numbers are striking, but it's an observational study—correlation, not proof of causation. Men who sauna frequently may also exercise more, sleep better, or have other protective habits. The researchers adjusted for those factors as best they could, but you can't eliminate all confounding variables in observational research.
A 2023 randomized controlled trial on sauna and mood
In 2023, researchers at the University of Jyväskylä in Finland published a small randomized controlled trial. They split 47 healthy men into two groups: one used a sauna four times per week for three weeks; the other didn't use one at all.
The sauna group reported significant improvements in positive mood and reductions in negative mood compared to controls. The effects were strongest in men who started with lower baseline mood scores. Small study, short duration—but it's one of the few controlled trials we have, and the results align with the observational data.
Sauna and psychosis risk
A 2024 study from the same Finnish cohort examined sauna use and psychotic disorders. Men who used a sauna 2 to 3 times per week had a 40% lower risk of developing a psychotic disorder over the follow-up. The risk reduction was even greater in men who also exercised regularly.
The authors speculate the protective effect may come from reduced inflammation, improved stress regulation, and better social connection (since sauna use in Finland is often social). That's speculative, not proven, but it's an area worth watching.
How sauna might affect the brain
Researchers have identified several plausible mechanisms. None are settled science, but together they form a coherent picture.
Heat shock proteins and neuroprotection
When your body temperature rises during a sauna session, your cells produce heat shock proteins. These repair damaged proteins and protect cells from stress. In the brain, they reduce inflammation and support neuron survival. Animal studies suggest repeated heat exposure can increase brain-derived neurotrophic factor (BDNF), a protein that supports neuron growth and maintenance. Low BDNF levels are linked to depression and anxiety.
The endocannabinoid system
A 2021 study measured endocannabinoid levels in men before and after a 30-minute sauna session. Endocannabinoids are the body's natural version of cannabis compounds—they bind to the same receptors and produce calm and well-being. The researchers found sauna use increased endocannabinoid levels by roughly 30%. The increase correlated with improvements in self-reported mood.
This is the same mechanism behind “runner's high.” Sauna may trigger a similar response through heat stress rather than cardiovascular exertion.
Blood flow and the prefrontal cortex
Heat exposure increases heart rate and dilates blood vessels, including those in the brain. A 2020 functional MRI study found that a single sauna session increased blood flow to the prefrontal cortex—the part of the brain responsible for executive function, decision-making, and emotional regulation. Increased blood flow here is associated with improved mood and cognitive performance.
Stress hormone regulation
Repeated heat exposure appears to blunt the body's cortisol response to stress. A small 2019 study found that men who used a sauna four times per week for one month had lower baseline cortisol levels and a reduced cortisol spike in response to a standardized stress test. Chronic high cortisol is linked to depression, anxiety, and cognitive decline. Anything that helps regulate the stress response is worth paying attention to.
What this means for you
If you already use a sauna for physical recovery or cardiovascular health, the mental health benefits are a bonus. If you're considering starting, here's what the research suggests:
- Frequency matters. The strongest mental health benefits in observational studies came from 4 to 7 sessions per week. That's more than most people do, but even 2 to 3 sessions per week showed meaningful reductions in depression risk.
- Duration and temperature. Most studies used Finnish-style saunas at 80 to 100°C (176 to 212°F) with sessions lasting 10 to 20 minutes. Infrared saunas operate at lower temperatures, and we don't yet have comparable data on their mental health effects.
- Combine with other habits. The men in the Finnish studies with the best mental health outcomes tended to exercise, eat well, and maintain social connections. Sauna appears to be a piece of the puzzle, not the whole picture.
- Consult a doctor if you have health conditions. Sauna use is safe for most healthy men, but if you have cardiovascular disease, low blood pressure, or take medications that affect your heart rate or blood pressure, discuss it with your doctor first.
The bottom line
The research on sauna and mental health is still emerging, but the direction is consistent. Multiple observational studies and a handful of controlled trials suggest regular sauna use is associated with lower rates of depression, better mood, and possibly reduced risk of more serious mental health conditions. The mechanisms—heat shock proteins, endocannabinoid release, increased cerebral blood flow, cortisol regulation—are biologically plausible and supported by preliminary evidence.
No one should treat sauna as a replacement for therapy, medication, or other established mental health treatments. But if you're looking for a simple, drug-free practice that may support your mental health, the evidence says it's worth taking seriously.
If you have specific concerns about your mental health, talk to a doctor or mental health professional. This information is for educational purposes and does not constitute medical advice.
Frequently asked questions
How often do you need to use a sauna to see mental health benefits?
The strongest associations in observational research came from 4 to 7 sessions per week, but using a sauna 2 to 3 times per week was still linked to a meaningful reduction in depression risk. Frequency appears to matter more than any single long session.
What temperature and session length do most sauna and mental health studies use?
Most of the studies referenced in the research used Finnish-style saunas at 80 to 100°C with sessions lasting 10 to 20 minutes. Infrared saunas operate at lower temperatures, and comparable mental health data for them doesn't yet exist.
Why might sauna use improve mood?
Researchers point to several plausible mechanisms: heat shock proteins that reduce brain inflammation, an increase in endocannabinoid levels after a session, greater blood flow to the prefrontal cortex, and lower baseline cortisol levels with repeated use. None of these are settled science, but together they form a coherent picture.
Is sauna a replacement for therapy or medication for mental health?
No. The research suggests sauna use may support mental health as part of a broader set of habits, but it shouldn't replace therapy, medication, or other established treatments. If you have specific mental health concerns, talking to a doctor or mental health professional is the right first step.