Finland has roughly three million saunas. With 5.6 million people, that is more than one for every two Finns – in apartments, summer cottages, office buildings, even Parliament. Children are introduced as babies; important conversations happen on the benches; and in 2020, UNESCO inscribed the Finnish sauna tradition on its list of humanity's intangible cultural heritage.
So when the world asks what sauna actually does for health, Finland is where both the longest tradition and much of the research live. This guide gives you an honest reading of that research, an explanation of why the ritual feels so distinct, and – just as usefully – how to sauna properly, the way it is actually done here.
What makes a sauna Finnish
A traditional Finnish sauna is a wood-lined room heated to roughly 70–100°C by a stove (kiuas) topped with stones. The air is dry – until you ladle water onto the hot stones and löyly rises: a soft, enveloping wave of steam that is the heart of the whole experience. Finnish sauna is taken in sessions: heat until it feels right, cool down outdoors or under a shower, return, repeat. At a lakeside cottage in summer, the cool-down is the lake; in winter, for the committed, a hole cut in the ice.
Two things distinguish it from the spa-menu version elsewhere: the löyly, and the unhurriedness. Nobody times a Finnish sauna. It ends when it ends.
What the research suggests – told honestly
Finland's sauna habit created a natural laboratory, and the best-known findings come from long-running Finnish population studies – most famously from Kuopio in eastern Finland, where thousands of middle-aged men have been followed for decades. Those studies have repeatedly found that frequent sauna bathing is associated with favourable long-term outcomes, particularly cardiovascular ones, with more frequent bathing (four to seven times weekly) showing stronger associations than occasional use. Researchers have also noted that sauna's short-term effects on heart rate and blood vessels resemble those of moderate exercise.
Now the honest part. These are observational studies: they show association, not proof of cause. People who sauna most may differ in other ways, and researchers cannot randomise decades of bathing habits. The fair conclusion – and roughly the one the researchers themselves draw – is that regular sauna bathing is a pleasant, low-risk habit for most healthy people, consistently associated with good outcomes, and plausibly beneficial through mechanisms resembling mild exercise and deep relaxation. Not a treatment; not a cure; a very good habit.
Why sauna feels the way it does
Set the epidemiology aside and the immediate effects need no studies to notice. Heat relaxes muscle and slows you down bodily; the löyly rhythm – heat building, steam washing over, retreat to cool air – gives the session a natural tempo that quiets thinking remarkably fast. There is no phone on the benches, nothing to optimise and nowhere to be, which makes sauna one of the last reliably undistracted places modern life offers.
Finns rarely explain sauna in wellness terms at all. It is where you go to become quiet – saunarauha, sauna peace. The physiology and the psychology arrive together, which may be the real explanation for those population studies.
How to sauna the Finnish way
Before: prepare simply
Shower first – always. Skip heavy meals and skip alcohol; a sauna is dehydrating work, so drink water beforehand. Leave jewellery and watches outside; metal heats fast.
In the heat: löyly, patience, and the whisk
Sit where the heat suits you – higher benches are hotter. Ladle water onto the stones in small amounts and let each löyly settle before the next. Stay 5–15 minutes or simply as long as it feels good; comfort, not endurance, is the metric. In summer, do as the Finns do and use a vihta (in eastern Finland, vasta) – a whisk of fresh birch branches, dipped in water and patted gently over the skin. It scents the löyly with birch and leaves skin feeling remarkably alive.
The cool-down: the half everyone skips
Step out. Cool air, a shower, a lake, or – for the initiated – winter swimming. The contrast is not an optional extra; the alternation of heat and cool is what gives sauna its characteristic afterglow, and most first-timers who "don't get" sauna have skipped it. Two or three heat-cool rounds is a typical session.
After: the wind-down
Do not rush back to the world. Rehydrate properly, eat something small – the traditional sauna sausage has its devotees – and give yourself the drowsy, honey-limbed half hour that Finns consider the whole point. Many will tell you the best sleep of the week follows sauna night.
Sauna etiquette, briefly
For travellers and newcomers: sauna is unhurried and unpretentious. Nudity is normal and non-sexual in Finnish sauna culture (public saunas separate genders or advertise swimsuit policies – follow the house rules). Conversation is welcome, silence equally so. Throwing löyly is usually the privilege of whoever sits nearest the stove – ask before you ladle generously. And nobody, ever, is impressed by heat endurance contests.
A culture, not a treatment
It is worth saying plainly: Finns did not build three million saunas for cardiovascular statistics. Sauna endures because it answers something older – cleanliness once, community and quiet still. The research is a welcome guest in the sauna, not the reason for it. Approach it that way and the "benefits" largely take care of themselves. The same could be said of Finland's other daily rituals – the berry habit at breakfast, and the xylitol pastille after lunch: a national talent for small repeated acts of self-care.
Frequently asked questions about Finnish sauna
How often do Finns take a sauna?
Once a week is a common minimum; many go several times weekly. The long-running Finnish studies grouped bathers by frequency, with four to seven sessions weekly the most frequent category.
How hot is a Finnish sauna?
Typically 70–100°C, adjusted by bench height and by how much löyly (steam from water on the stones) is thrown.
How long should you stay in a sauna?
As long as it feels comfortable – commonly 5 to 15 minutes per round, over two or three rounds with cool-downs between. Comfort, not endurance, is the Finnish rule.
What is löyly?
The steam that rises when water is ladled onto the hot stones, and by extension the whole character of a sauna's heat. Good löyly is soft, enveloping and central to the experience.
Is sauna good for you?
Large Finnish observational studies associate frequent sauna bathing with favourable long-term health outcomes, and its short-term effects resemble mild exercise. As observational research it shows association rather than proof, but for most healthy people sauna is a low-risk, well-loved habit.
Who should be careful with sauna?
Anyone pregnant, with a heart or blood-pressure condition, or feeling unwell should ask a healthcare professional first. Never sauna under the influence of alcohol, and leave immediately if you feel dizzy.
The quietest room in Finland
Three million saunas are three million answers to the same question: where does a person go to get warm, get clean, and get quiet? The research adds a reassuring footnote, but the practice needs no defending – it has been defending itself for a thousand years, one löyly at a time.
Build your ritual: explore our sauna collection for buckets, ladles, whisks and authentic Finnish sauna accessories – and browse the wider lifestyle range for the rest of the Nordic evening.
This article is for general information only and is not medical advice. If you have a health condition, speak to a professional before regular sauna use.