For centuries, cultures around the world have turned to heat as a remedy for emotional distress. Sweat lodges, bathhouses, and saunas have long been woven into social and spiritual traditions, with practitioners often claiming that warmth soothes not just the body but the mind. Yet modern science has been slow to test whether those beliefs hold up under clinical scrutiny.
Eva Hilland, a cognitive neuroscientist at Oslo Metropolitan University, recently set out to review the scientific literature for evidence that would justify recommending heat exposure as a legitimate mental health intervention. What she found was a body of research riddled with gaps. "There are many knowledge gaps," she acknowledged. Still, the limited evidence she uncovered struck her as promising enough to warrant further investigation. "So we just saw the potential," she said.
Her conclusions highlight a curious paradox. While researchers have developed a reasonably solid understanding of how saunas and other forms of heat exposure affect the cardiovascular system, the mental health picture remains largely unexplored. The physiological mechanisms—improved circulation, reduced blood pressure, and enhanced vascular function—are well documented. The psychological mechanisms are not.
That gap is becoming harder to ignore as sauna culture experiences a resurgence. Across the United States and in Nordic countries like Norway, where sauna-going is deeply embedded in daily life, a new generation of enthusiasts is embracing the practice. Many pair their sessions with cold plunges or winter swimming, following a wellness trend that has moved from niche subcultures into the mainstream.
The trend was on full display in Oslo in late September 2026, when the International Sauna Congress brought together devotees and researchers. Participants gathered at Sukkerbiten, a cluster of small saunas along the Oslo Harbor waterfront, situated between the city's Opera House and the Munch Museum. The Oslo Sauna Association operates the site, which features saunas in a variety of styles lined up along the pier. Attendees, including Tony Stepanow from Finland, took part in sessions that showcased both the social ritual and the growing international appetite for heat-based wellness.
Floating saunas, in particular, have become a visible symbol of this movement, combining the sensory intensity of heat with the bracing shock of cold water. But the scientific community is still trying to determine whether such practices offer measurable benefits for conditions like depression and anxiety—or whether the reported mood lift is simply a pleasant but temporary side effect.
Hilland's review suggests the question is worth pursuing rigorously. The studies that do exist point toward potential, but they are too few and too limited in scope to support broad clinical recommendations. That caution is typical of emerging fields, where early signals often outpace the evidence needed to guide medical practice.
Mental health researchers face a particular challenge in this area. Unlike cardiovascular outcomes, which can be measured through blood pressure, heart rate, and blood vessel function, mental health outcomes rely on subjective reports, standardized questionnaires, and diagnostic interviews. Designing trials that isolate heat's effects from other variables—such as relaxation, social interaction, and the placebo effect—is methodologically complex.
There is also the question of dosage. How hot? How long? How often? Sauna traditions vary widely, from the dry heat of Finnish saunas to the steam of Turkish baths to the infrared cabins now popular in gyms and spas. Without standardized protocols, comparing results across studies becomes difficult, and recommending a specific regimen becomes nearly impossible.
Despite these obstacles, the intersection of heat and mental health is attracting more attention. As sauna use grows as a health practice, scientists are beginning to study its benefits with greater seriousness. The popularity of the practice may itself help drive research forward, as funding agencies and academic institutions recognize a public eager for evidence-based guidance.
For now, Hilland and her colleagues are urging a measured approach. The history of heat as a healing tradition is long and rich, but history alone cannot substitute for controlled trials. The belief that warmth can relieve psychic suffering may yet be validated by science—but only if researchers can fill the knowledge gaps that currently define the field.
What is clear is that the conversation is shifting. What was once dismissed as folklore or lifestyle trend is now being examined through the lens of clinical research. The question is no longer whether people find saunas pleasurable or relaxing—that much is evident—but whether the heat itself produces measurable, lasting improvements in mental health.
Answering that question will require more than anecdotal enthusiasm. It will require rigorous trials, standardized protocols, and a willingness to test cherished beliefs against hard data. If the early promise holds, heat could one day join the ranks of evidence-based interventions for depression. If not, the sauna will remain what it has always been: a beloved ritual, a social gathering place, and a source of comfort—but not a cure.
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