Infrared Sauna and Alcohol: Why They Do Not Mix
Do not combine alcohol and a sauna, infrared or traditional. Alcohol is the factor that turns up most consistently in forensic studies of sauna deaths, and the hangover sauna rests on a myth: you cannot sweat out alcohol in any amount that matters.
Do not use a sauna while drinking, later the same day, or while hungover. Alcohol and heat both lower blood pressure and drain fluid, and alcohol blunts the warning signs that tell you to get out.
This is general information, not medical advice. With a heart condition or blood pressure medication, ask your doctor before using any sauna.
- 01Alcohol is the factor that forensic studies of sauna deaths, Swedish and Finnish alike, find most consistently.
- 02You cannot sweat out alcohol. The liver clears almost all of it; sweat and breath remove only a small fraction.
- 03Feeling better after a hangover sauna comes from the water you drink and time passing, not from detox.
- 04After drinking, wait until you are fully sober and rehydrated, in practice the next day, and never sauna alone after a night out.
Why Alcohol and Heat Do Not Mix
A sauna works by moving heat out of your body: skin blood vessels open wide, your heart speeds up and blood pressure dips. For a sober, healthy person that is normal, and a 2018 Mayo Clinic Proceedings review of Finnish research lists lower blood pressure among the proposed reasons regular bathing is linked with better heart health.
Alcohol pushes the same way, widening blood vessels and lowering blood pressure, so the effects stack. Blood pools in the skin, the brain can briefly run short, and the classic result is fainting as you stand up to leave. A 1988 Finnish review warned that heavy drinking in the sauna may weaken the body's ability to hold its blood pressure, making fainting and accidents more likely.
Heavy drinking can also disturb the heart's rhythm, and the 1988 review noted that sauna heat may add to that risk through an adrenaline-type stress response. A 2019 review of sudden cardiac death linked regular sauna use with lower risk overall, the protective side covered in our guide to infrared sauna and heart health. But it attributed the few sauna-linked sudden deaths to dehydration, low blood pressure and rhythm disturbances from sauna combined with alcohol.
In a sauna while drunk, you barely notice the usual exit signals, such as dizziness, nausea or a building headache, which our guide on how long to stay in an infrared sauna treats as a cue to leave, not to push through. People stay in too long, doze off on the bench, or stand up too fast and fall. And both alcohol and heat drain fluid, so dehydration deepens every other effect.
How the Effects Stack
What the Forensic Research Found
A Finnish study of deaths in saunas from 1990 to 2002 concluded that they are rare even in Finland, where sauna bathing is part of everyday life. Yet a large share of the people who died were under the influence of alcohol, and the authors wrote that alcohol's role as a risk factor had grown. Their prevention advice: less drinking, and never leaving a drunk bather alone in the sauna.
A Swedish series of forensic autopsies covering 1992 to 2003 found the same pattern. Most of those who died were middle-aged men, most died on a weekend, and a clear majority of those whose blood was checked had alcohol in it, often at high concentrations. Alcohol was linked to more of the deaths than heart disease was, and nearly everyone found dead in a sauna was alone. The authors called bathing alone a risk that is easy to avoid.
The 1988 review adds accidents short of death, from burns and head injuries to heat stroke after passing out. Its authors admitted that direct research on the interaction was lacking then, so their account of the mechanism was reasoned rather than measured, but the later forensic series fit their conclusion: heavy drinking in the sauna, and sauna during a hangover, create real health risks.
All of this research covers traditional saunas, which run hotter than infrared cabins. That does not make an infrared sauna after drinking safer: it still raises core temperature, makes you sweat and opens your blood vessels. And home infrared units are often used alone, the exact pattern the Swedish researchers flagged.
Can You Sweat Out Alcohol? The Hangover Myth
The idea of sweating out alcohol has a grain of truth. A small amount does leave the body unchanged through the breath, urine and sweat, which is why a breathalyzer works. But those routes carry only a small fraction; the liver breaks down almost all of it, at a fairly steady pace that heat does not speed up.
A rough estimate shows why sweat barely registers. Alcohol spreads through all the water in your body, tens of liters of it, so even a liter of sweat, a lot for one session, carries away only a small part of a single drink.
So why do people swear by a sauna for a hangover? Because of what happens around it. Dehydration accounts for part of a hangover's thirst, headache and dizziness, and the water most people drink before and after a session does the useful work. The rest is the clock: by the time you have warmed up, showered and cooled down, another hour or two has passed. The sweat itself only takes away more fluid.
The sauna hangover cure is not harmless, either: the 1988 review singled out the hangover phase as a time of higher arrhythmia risk. Our look at the research on infrared sauna detox covers what sweat can and cannot remove, and alcohol is one of the clearest cases: the liver, not your sweat, does the clearing. Water, food, sleep and time will do more for a hangover than heat.
Practical Rules for Sauna and Alcohol
None of this means giving up either one, only keeping them apart:
- 01No alcohol before or during a session, including the single beer on the bench.
- 02After drinking, wait until you are fully sober and rehydrated: the next day at the earliest, once any hangover has passed.
- 03Never use a sauna alone after a night out, and never leave a friend who has been drinking alone in one.
- 04Drink water first, and get out at the first sign of dizziness, nausea or a pounding heart.
When you do go back in, follow the usual routine from our infrared sauna session guide: water beforehand, a moderate temperature and a planned exit. After a heavy night, keep that first session shorter and cooler than usual.
What About One Beer in the Sauna?
I grew up in Finland, where a cold beer in the sauna or on the porch between rounds is close to a national ritual. It is still a bad idea. Even one drink is a diuretic and a vasodilator, added just as your body is losing fluid and widening its blood vessels, and one tends to become three. At a lakeside cottage there is also the swim between rounds, and the 1988 review lists drowning while swimming among the serious accidents. If the beer matters to you, have it after the last round, once you have cooled down and had water.
Who Is at Extra Risk
Some people have even less margin for error:
A rhythm problem, coronary heart disease, heart failure or a past heart attack. Rhythm disturbances are among the mechanisms blamed for the rare sudden deaths linked to sauna and alcohol.
Diuretics, beta-blockers and other drugs that lower blood pressure add a third effect on top of alcohol and heat. The same applies to low blood pressure or a history of fainting.
More alcohol to clear and a rougher hangover mean a longer wait. Middle-aged men who drink heavily were the main risk group in the Swedish series.
If any of these apply, ask your doctor about sauna use in general. Our guide to infrared sauna side effects lists other conditions and medications that call for medical advice first.
The Bottom Line
Sauna and alcohol do not mix, and an infrared cabin's lower air temperature does not change that. Keep them on separate days, and never bathe alone after a night out. Used sober and sensibly, sauna bathing is generally safe for healthy people.
FAQ
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- Sauna deaths in Sweden, 1992-2003. American Journal of Forensic Medicine and Pathology, 2008.
- Death in sauna. Journal of Forensic Sciences, 2008.
- The sauna and alcohol. Annals of Clinical Research, 1988.
- Is sauna bathing protective of sudden cardiac death? A review of the evidence. Progress in Cardiovascular Diseases, 2019.
- Cardiovascular and Other Health Benefits of Sauna Bathing: A Review of the Evidence. Mayo Clinic Proceedings, 2018.
We do not run a test lab. Figures on this page come from the sources above, from published manufacturer specifications, or are reasoned estimates that are labelled as such.
