Which Has More Health Benefits, a Sauna or a Steam Room?
Author: Dr Cal Shields MBChB LLM MPhil MRCS (ENT) | Longevity and Aesthetics Doctor
Both saunas and steam rooms have earned a place in the modern wellness landscape. Walk into any gym, spa, or recovery clinic and you will likely find one or both. They share a common premise: expose the body to heat, and good things happen. However, whilst the premise is the same, the scientific evidence behind each is far from equal.
Saunas use dry heat, typically generated by heated rocks, electric elements or infrared heaters, reaching temperatures of 65–100°C with humidity levels between 10 and 20 per cent. Steam rooms, by contrast, produce moist heat through steam generators, operating at lower temperatures of around 40–49°C but with humidity approaching 100 per cent. This distinction matters more than most people realise, because it fundamentally changes how the body responds to the heat and, consequently, the health benefits that follow.
In this article, we examine what the research actually says. We compare the two modalities across cardiovascular health, inflammation, mental health, muscle recovery, and more.
How They Work: The Science of Dry Versus Moist Heat
When the body is exposed to heat, it initiates a series of responses designed to maintain a safe core temperature. The heart rate increases, blood vessels dilate, and sweating begins. These responses occur in both saunas and steam rooms, but the way they unfold differs considerably.
In a dry sauna, sweat evaporates efficiently from the skin surface. This evaporation is the body’s most effective cooling mechanism, and it allows for a controlled, sustained heat exposure. The body heats up gradually, and the thermoregulatory system manages the process with relative efficiency.
In a steam room, the near-total humidity prevents sweat from evaporating. The body’s primary cooling mechanism is essentially disabled. As a result, core temperature rises more quickly and more aggressively. A direct comparison study found that core body temperature increased by 1.61°C in a steam room versus 1.16°C in a dry sauna, and heart rate rose by 72 beats per minute in steam versus 59.4 in dry heat. Despite running at lower temperatures, the steam room imposed significantly greater physiological stress.
This is an important distinction. Greater stress does not necessarily mean greater benefit. In fact, the controlled, sustainable heat exposure of a dry sauna appears to be what activates the body’s most beneficial adaptive responses, particularly through molecules called heat shock proteins (HSPs). These proteins, released in response to thermal stress, protect cells from damage, reduce inflammation, and support cardiovascular function. They are central to many of the benefits explored below.
Cardiovascular Health: Where Saunas Pull Ahead
If there is one area where the sauna distinguishes itself beyond doubt, it is cardiovascular health. The volume and quality of evidence here is substantial, anchored by large prospective studies that have tracked outcomes over decades.
The landmark study in this field comes from Finland. Researchers followed 2,315 middle-aged men for a median of 20.7 years as part of the Kuopio Ischaemic Heart Disease Risk Factor Study. The results were striking. Compared with men who used a sauna just once per week, those who used one four to seven times per week demonstrated a 63 per cent lower risk of sudden cardiac death, a 50 per cent reduction in fatal cardiovascular disease, and a 40 per cent reduction in all-cause mortality. The relationship was dose-dependent: the more frequently men used a sauna, and the longer they stayed (sessions exceeding 19 minutes showed the greatest benefits), the lower their risk.
These are not modest reductions. A 40 per cent reduction in all-cause mortality places regular sauna use alongside some of the most effective lifestyle interventions available.
The mechanisms behind these outcomes are well characterised. Regular sauna use enhances endothelial function by increasing nitric oxide production, which causes blood vessels to relax and dilate. This improves blood flow, lowers blood pressure, and reduces arterial stiffness. A meta-analysis of heat therapy studies found significant reductions in both systolic and diastolic blood pressure (P < 0.0001), with improvements in vascular function that were comparable to those achieved through exercise training.
Reviews of sauna use for cardiovascular and peripheral arterial disease have confirmed these benefits, noting improvements in functional capacity and reductions in cardiovascular events. A systematic review also found that sauna use produces reductions in total cholesterol and LDL cholesterol.
Steam rooms, by comparison, have limited cardiovascular evidence. Some studies show short-term blood pressure reductions in healthy individuals after steam bathing, but there are no long-term outcome studies, no cohort data, and no comparable evidence of mortality reduction.
The verdict is clear: for cardiovascular protection, the sauna wins decisively.
Inflammation and Immune Function
Chronic low-grade inflammation is increasingly recognised as a driver of cardiovascular disease, type 2 diabetes, cognitive decline, and numerous other age-related conditions. Reducing systemic inflammation is therefore a meaningful health goal, and regular sauna use appears to achieve it.
The mechanism centres on heat shock proteins. When activated by thermal stress, HSP70 directly inhibits inflammatory signalling cascades, including the NF-κB pathway, which controls the expression of pro-inflammatory molecules such as TNF-α, IL-6, and IL-1β. This suppression of inflammatory signalling translates to measurable reductions in circulating inflammatory markers. A systematic review of dry sauna bathing found that regular use reduces C-reactive protein (CRP), one of the most validated biomarkers of systemic inflammation and an independent predictor of cardiovascular risk.
The immune system also benefits. Research has shown that a single Finnish sauna session produces significant increases in white blood cell and lymphocyte counts, suggesting enhanced immune surveillance. Over time, repeated sessions appear to train the immune system toward greater responsiveness whilst simultaneously reducing baseline pro-inflammatory markers.
For steam rooms, there is no comparable inflammatory marker research. The moist heat may provide temporary immune stimulation, but the evidence base simply does not exist for meaningful comparison.
Mental Health and Brain Protection
The relationship between sauna use and mental health represents one of the most compelling areas of emerging research. The findings go well beyond relaxation.
A controlled study on whole-body hyperthermia demonstrated that a single session of heat exposure produced significant reductions in depression scores, with antidepressant effects persisting at four and six-week follow-up. In a separate trial combining sauna with cognitive-behavioural therapy (CBT), 11 of 12 participants who completed the combined treatment no longer met diagnostic criteria for major depressive disorder. These are remission rates that substantially exceed what is typically observed with CBT alone.
An earlier Japanese study of infrared sauna therapy in patients with mild depression found significant improvements in somatic complaints (P < 0.001), appetite (P < 0.0001), and relaxation (P < 0.0001) after four weeks of daily sessions. Notably, the hormone ghrelin, which signals hunger, increased significantly, suggesting that thermal therapy helped restore appetite signalling disrupted by depression.
The neurochemistry behind these effects is well documented. Sauna exposure triggers the release of beta-endorphins at up to three times baseline levels, similar to the elevation achieved through running. Dopamine, the neurotransmitter involved in motivation and reward, also increases. EEG studies have recorded increases in theta and alpha brain wave activity during sauna bathing, frequencies associated with relaxation, creativity, and emotional processing. Participants consistently reported enhanced mental clarity and positive emotions.
Perhaps most significantly, regular sauna use may protect against neurodegenerative disease. In the same Finnish cohort, men who used a sauna four to seven times per week demonstrated a 66 per cent lower risk of dementia and a 65 per cent lower risk of Alzheimer’s disease compared with those who used one once weekly. The mechanisms likely involve heat shock proteins preventing the pathological protein aggregation that characterises these diseases, combined with improved cerebral blood flow.
A global sauna survey found that 83.5 per cent of regular sauna users reported improved sleep quality, and those using saunas five to fifteen times monthly reported significantly greater general mental wellbeing than less frequent users.
Steam rooms may provide temporary relaxation, but there are no studies examining their effects on depression, neurotransmitter changes, dementia risk, or sleep architecture. On mental health, sauna holds a commanding lead.
Muscle Recovery and Growth Hormone
For athletes and physically active individuals, what happens after training matters as much as the training itself. Here too, the sauna has demonstrated measurable benefits.
A randomised crossover study examined the effects of post-exercise infrared sauna on recovery in male basketball players. Twenty minutes of infrared sauna at 43°C following complex resistance and plyometric training significantly attenuated the decline in explosive performance compared with passive recovery. Muscle soreness was also substantially lower in the sauna group, with no adverse effects on autonomic recovery or sleep quality.
The mechanisms involve increased blood flow to damaged muscle tissue, facilitating the delivery of oxygen and nutrients whilst clearing metabolic waste. Heat shock proteins support recovery at the cellular level by assisting in protein refolding and clearing damaged cellular components. The parasympathetic activation that follows the heat stress phase also promotes the transition into an anabolic, recovery-focused state.
One of the more remarkable findings concerns growth hormone. A specific sauna protocol involving multiple 30-minute sessions with cooling periods between them produced a 16-fold increase in serum growth hormone levels, a hormone critical for muscle protein synthesis, bone density, and body composition. This response diminishes with repeated daily exposure, suggesting that weekly sauna sessions dedicated to recovery may optimise this effect.
Steam rooms are often cited for easing muscle tension, but this remains largely anecdotal. No comparable studies exist examining steam rooms and post-exercise recovery outcomes, growth hormone response, or neuromuscular performance.
Where Steam Rooms Do Excel
It would be misleading to suggest that steam rooms offer no benefits. In certain areas, they do hold genuine advantages.
Respiratory health is the clearest example. The warm, humid air of a steam room acts as a natural expectorant, loosening mucus and improving clearance from the airways. A clinical study found that steam inhalation in asthmatic patients produced improvements in peak expiratory flow rate, reduced respiratory discomfort, and lowered mucus viscosity. For individuals with congestion, sinusitis, chronic bronchitis, or mild asthma, steam rooms offer meaningful, direct relief that dry saunas cannot replicate.
Steam rooms also provide superior skin hydration. The moist heat opens pores and enhances moisture retention, which can benefit those with dry or dehydrated skin. The lower ambient temperature makes steam rooms more accessible for individuals who find the intense heat of a dry sauna intolerable, making them a useful entry point for those new to heat therapy.
It is worth noting, however, that the warm, humid environment of a steam room is also more conducive to bacterial and fungal growth, particularly in public settings. Rigorous hygiene practices are essential.
Why Choose Thriyv for Heat Therapy in Manchester
At Thriyv, sauna therapy is part of a broader, evidence-based wellness programme designed around the research presented above. Every protocol is informed by the scientific literature and tailored to individual health goals.
What distinguishes Thriyv is the integration. Sauna sessions can be combined with complementary recovery modalities, including cryotherapy, lymphatic drainage, and red light therapy, each selected on the basis of clinical evidence. This is not a spa experience masquerading as science. It is a doctor-led, science-backed approach to longevity and performance, grounded in the same research that has demonstrated the cardiovascular, anti-inflammatory, and neuroprotective benefits of regular heat exposure.
For those in Manchester looking to incorporate sauna therapy into their routine, Thriyv offers the environment, expertise, and personalised guidance to do so safely and effectively.
Conclusion
Both saunas and steam rooms apply heat to the body, and both can produce positive effects. However, the evidence gap between the two is significant.
Sauna use is supported by large prospective studies demonstrating reduced cardiovascular mortality, lower all-cause mortality, reduced systemic inflammation, measurable antidepressant effects, and protection against neurodegenerative disease. These findings come from cohorts of thousands, tracked over decades. Steam room research, whilst not absent, does not approach this level of depth or rigour.
Steam rooms excel in specific areas: respiratory relief, skin hydration, and accessibility for heat-sensitive individuals. These are meaningful benefits and should not be dismissed. However, when the question is which modality offers more health benefits, the answer is clear.
For general health, an evidence-based starting point would be sauna sessions of 15 to 20 minutes at 70–100°C, two to three times per week. For maximal cardiovascular benefit, the Finnish data suggests four to seven sessions weekly.
The sauna is one of the oldest, simplest, and most well-evidenced health interventions available. The research is extensive, the benefits are measurable, and the barriers to access are low. For those seeking to invest in their long-term health, it is a remarkably effective place to start.
Don’t just live – Thriyv
