UK Sauna Boom: Health Benefits, Risks & the Rise of Social Bathing

Across Britain, a quiet revolution is taking place, one fueled by heat, steam and a surprising yearning for connection. From converted horseboxes and repurposed seal pools to purpose-built spaces, saunas are popping up in unexpected places, and their popularity is soaring. The British Sauna Society now lists around 640 saunas nationwide – a significant increase from the 540 at the start of the year – and projections suggest the UK could become the world’s largest sauna market by 2033, potentially surpassing Finland and Germany. A recent report indicates this growth is far from slowing.

Beyond the Heat: Exploring the Wellbeing Benefits

But is this surge in sauna leverage simply a wellness trend, or does it represent a genuine tonic for the nation’s health? The answer, it seems, is complex. While the immediate appeal may be the soothing heat, emerging research suggests the benefits extend far beyond the physiological. The strongest evidence currently points to substantial cardiovascular benefits. Professor Setor Kunutsor, Evelyn Wyrzykowski research chair in cardiology at the University of Manitoba in Canada, explains that individuals engaging in four to seven sauna sessions per week experience a 40 to 60% reduction in cardiovascular risk compared to those using saunas just once a week. “In our randomised controlled trial, we showed a systolic blood pressure reduction of 8mmHg after eight weeks of engaging in three sauna sessions per week. Here’s a huge reduction,” he states.

The physiological mechanisms behind these benefits are becoming clearer. Sauna use induces a controlled heat stress, mimicking the effects of moderate exercise. As the body temperature rises, heart rate increases and blood flow expands, improving blood vessel, heart, and lung function, while simultaneously reducing blood pressure, inflammation, and harmful blood fats like cholesterol. Researchers are also investigating potential impacts on the immune system, hormonal regulation, and cellular stress responses. The feelings of relaxation often experienced after a sauna session are likely linked to the release of endorphins, though this connection requires further study.

Debunking Detox Myths and Uncovering the Social Element

Despite popular belief, the idea of “sweating out toxins” through sauna use is largely unsupported by scientific evidence. Professor Kunutsor cautions that while sweat does contain trace amounts of metals, sweating is primarily a cooling mechanism and doesn’t significantly detoxify the body. Though, a new study analyzing data from over 1,900 UK sauna users reveals a more nuanced picture, highlighting the profound impact of the social aspect of sauna bathing.

The research, led by Martha Newson at the University of Greenwich in London, found that regular sauna use was associated with improved physical and mental wellbeing, with the strongest benefits reported by those who felt a strong sense of belonging within a sauna community. This suggests that much of the positive effect stems from the connection and shared ritual experienced among bathers. Newson describes a sauna as “people getting stripped off and sitting in a hot room,” but emphasizes that this vulnerability and shared experience fosters unusually strong social bonds. The practice taps into a fundamental human need for connection, something increasingly lacking in our digitally-driven world.

The Rise of Community Saunas and a Search for Connection

Gabrielle Reason, director of the British Sauna Society, believes the rapid growth of community saunas reflects a broader societal search for connection. “With more of our attention on screens, we’re away from people and increasingly indoors. That has meant less physical contact, fewer face-to-face conversations, and less time out in nature,” she explains. This shift has created a void that community saunas are uniquely positioned to fill.

At Fire and Ice Wellness in north Bristol, the atmosphere is described as bucolic, with the sauna situated in the grounds of a former wildlife park. Here, the experience extends beyond the heat, with an ice bath repurposed from an classic seal pool. Inside, conversations flow freely, with strangers sharing personal struggles and offering support. Jamie Winn, Fire and Ice’s co-founder, describes the space as an emotional “safety net,” recalling one visitor who confided about divorce and personal challenges, stating the space had “quite literally saved my life.”

Navigating the Risks: Hydration, Blood Pressure, and Pre-existing Conditions

While the benefits of sauna use are becoming increasingly clear, it’s crucial to acknowledge the potential risks, particularly when combined with cold-water immersion. Professor Mike Tipton, an extreme environments physiologist at Portsmouth University, warns that sweating in the sauna leads to fluid loss, while cold water causes blood to shift to the core and triggers increased urine production – a process known as cold-induced diuresis. This combination reduces blood volume, potentially leading to dizziness, fainting, and even injury when blood vessels reopen upon warming.

Tipton advises starting well-hydrated and engaging in gentle leg movement to prevent blood pooling. Individuals should stand up slowly and be aware of warning signs such as dizziness, nausea, or tunnel vision. He also cautions against prolonged sauna sessions, noting that repeated cycles increase the risk of adverse effects. People with pre-existing cardiovascular disease should consult with a healthcare professional before using saunas or ice baths.

Best Practices and Future Research

For most individuals, moderation appears to be key. Professor Kunutsor suggests that reaping optimal benefits requires a frequency of 3-7 sessions per week, each lasting approximately 15-20 minutes. The British Sauna Society offers guidance on safe sauna practices on their website, including recommendations for hydration and listening to your body. Learn more about safe sauna use here.

As the UK’s sauna boom continues, ongoing research will be vital to further understand the full spectrum of benefits and risks. The British Sauna Society is actively supporting UK-based research into the health impacts of sauna and thermal bathing, building relationships with academic and institutional partners. Recent findings on the power of collective sauna rituals highlight the importance of considering the social and cultural dimensions of this ancient practice.

Leaving Fire and Ice, the air feels cool against skin still radiating heat, carrying a faint scent of woodsmoke. In an era defined by digital disconnection and increasing stress, the warmth, human connection, and sense of wellbeing offered by saunas may be precisely what many are seeking.