Get them out of the sauna immediately, have them lie flat with their feet elevated about 12 inches, cool them down with wet cloths on the neck and armpits, and give small sips of cool water. Call emergency services if they lose consciousness, become confused, vomit, or have hot dry skin that isn't sweating.
You're sitting in a sauna, maybe ten minutes in, when the guy next to you goes pale. Or maybe it's you—the world tilts, your chest tightens, and that pleasant heat suddenly feels like too much.
Saunas are safe for most people, but heat stress is real. Your body works hard to cool itself, and sometimes that system gets overwhelmed. Here's exactly what to do, step by step, based on how the body responds to heat exposure and what emergency medicine actually recommends.
Step One: Get Them Out of the Heat Immediately
This is not negotiable. Do not wait to see if it passes. Do not grab water first. Do not sit them down and fan them.
Open the door and get them out of the sauna room. Heat-related illness progresses fast. What starts as lightheadedness can become loss of consciousness within minutes. The moment someone says they feel off, or you notice they look off, the sauna session is over for them.
If they cannot walk steadily, support their weight. Do not let them try to "tough it out" and walk on their own. Heat affects coordination and judgment. The same way alcohol impairs your ability to recognize how drunk you are, heat stress impairs your ability to recognize how overheated you are.
Step Two: Get Them Horizontal and Elevate Their Feet
Once they are out of the sauna, have them lie down on their back. Elevate their feet about 12 inches—on a bench, a rolled-up towel, or your bag. This helps blood return to the brain.
Here is why this matters. When you are in a sauna, your blood vessels dilate to dump heat through your skin. A lot of blood pools in your legs and arms. When you stand up quickly, or when your body is already stressed from heat, blood pressure drops. That drop is what causes fainting. Lying down with feet elevated counteracts that.
If they are conscious, keep them lying down for at least five minutes before trying to sit up. If they sit up too fast, they may pass out again.
Step Three: Cool Them Down Actively
Passive cooling—just sitting in a cooler room—works, but active cooling works faster.
Remove any excess clothing. If they are wearing a shirt, take it off. If they are wearing a hat or headband, remove it. The head and torso are where you lose heat fastest.
Apply cool, wet cloths to their neck, armpits, and groin. These are areas where major blood vessels run close to the skin surface. Cooling the blood there cools the whole body faster than putting a cloth on their forehead.
If they are alert and can stand safely, a cool shower works even faster. Not cold—cool. Ice water causes blood vessels to constrict, which actually traps heat inside the body. Cool water around 60 to 70 degrees Fahrenheit allows heat to leave without shocking the system.
Step Four: Give Small Amounts of Cool Water
If they are conscious and can swallow without difficulty, give them small sips of cool water. Not gulps. Not a full bottle in one go. Small sips, every 30 seconds or so.
Why small sips? Drinking too much water too fast when overheated can trigger vomiting, which makes dehydration worse and complicates things. The goal is rehydration, not volume.
Do not give them sports drinks, electrolyte tablets, or anything with caffeine or alcohol. Plain cool water is all they need in this moment. Electrolytes matter for recovery, but right now the priority is temperature regulation and hydration without upsetting their stomach.
Step Five: Monitor for Signs That Require Medical Attention
Most people recover within 10 to 15 minutes of cooling down and hydrating. But some situations need a doctor.
Call emergency services if any of these are present:
- Loss of consciousness, even briefly
- Confusion, disorientation, or slurred speech
- Vomiting
- Body temperature that remains high (feels hot to the touch) even after 15 minutes of cooling
- Chest pain or pressure
- Rapid, weak pulse that does not slow down after resting
- Skin that is hot and dry instead of sweaty
Hot, dry skin is the hallmark of heat stroke, which is a medical emergency. In normal heat stress, you sweat. When the body's cooling system fails completely, sweating stops. That is the danger zone.
Why This Happens: The Mechanism Behind Feeling Unwell
Understanding why someone feels unwell in a sauna helps you recognize the early signs and act before things escalate.
Heat stress triggers three main responses in the body:
Vasodilation. Blood vessels widen to increase blood flow to the skin. This is how your body dumps heat, but it also drops your blood pressure. That drop is what causes dizziness, lightheadedness, and that "grey" feeling.
Dehydration. You lose fluid through sweat. Even in a 15-minute session, you can lose half a liter of sweat. If you started dehydrated, that loss hits harder and faster.
Heart rate increase. Your heart works harder to pump blood to the skin. A typical sauna session can raise your heart rate to 120 to 150 beats per minute—similar to moderate exercise. For someone with undiagnosed cardiovascular issues, that load can be too much.
The combination of lower blood pressure, less fluid volume, and higher heart rate is what makes people feel unwell. It is not a weakness thing. It is a physiology thing.
Who Is Most at Risk
Some men are more susceptible to heat stress in a sauna. If any of these apply, extra caution is warranted:
- Anyone who drank alcohol in the past few hours. Alcohol dehydrates and impairs the body's temperature regulation.
- Anyone who exercised heavily before the sauna. They are already dehydrated and heat-stressed.
- Anyone with a fever, cold, or infection. Their body is already fighting something.
- Anyone on medications that affect blood pressure, heart rate, or sweating. Beta-blockers, diuretics, and some antidepressants fall into this category.
- Anyone who skipped meals. Low blood sugar plus heat stress is a bad combination.
- Anyone who is new to sauna use. Acclimatization matters. Regular users handle heat better than first-timers.
If you fall into any of these categories, keep sessions shorter—five to ten minutes max—and stay near the door.
What Not to Do
A few common mistakes people make when someone feels unwell in a sauna:
Do not pour cold water on them while they are still in the sauna. The shock can cause a sudden drop in blood pressure or trigger a panic response. Get them out first.
Do not give them salt tablets or salty snacks. The idea that heat stress is primarily a salt problem is outdated. Most cases of feeling unwell in a sauna are from dehydration and blood pressure changes, not electrolyte imbalance. Salt without water makes things worse.
Do not let them "walk it off." Walking increases blood flow to muscles and away from the brain, which can cause fainting. Resting horizontal is better than walking around.
Do not send them back in later that day. Even if they feel better after 20 minutes, their body has already been stressed. Pushing it again increases the risk of a more serious episode.
The Bottom Line for Practical Use
If someone feels unwell in a sauna, the sequence is simple:
- Get them out
- Get them flat
- Cool them down
- Give small sips of water
- Watch for warning signs
Most people recover quickly. But if confusion, loss of consciousness, vomiting, or hot dry skin appear, that is not something to manage on your own. Call for help.
Sauna use is generally safe, and serious incidents are rare. But rare does not mean impossible. Knowing what to do in those first few minutes is the difference between a five-minute recovery and a trip to the emergency room.
If you are new to sauna, start with five to eight minutes at a lower temperature. Stay hydrated before you go in. And always sauna with someone else—not because you need a buddy, but because heat stress can impair your judgment before you realize something is wrong. Having another person there who can recognize the signs
Frequently asked questions
What are the warning signs someone needs emergency help in a sauna?
Call emergency services if the person loses consciousness even briefly, shows confusion or slurred speech, vomits, has chest pain, or has skin that is hot and dry instead of sweaty. Hot dry skin in particular is a sign the body's cooling system has failed completely, which is a medical emergency.
Why do people feel dizzy or faint in a sauna?
Heat causes blood vessels to widen so the body can dump heat through the skin, which drops blood pressure and pools blood in the limbs. At the same time, you lose fluid through sweat and your heart rate climbs to levels similar to moderate exercise. That combination of lower blood pressure, less fluid, and a harder-working heart is what makes people feel lightheaded or faint.
Should you use cold water to cool someone down in a sauna?
Don't pour cold water on someone while they're still inside the sauna, as the shock can cause a sudden blood pressure drop. Once they're out, use cool rather than cold water, since ice-cold water causes blood vessels to constrict and can actually trap heat inside the body.
Who is most at risk of feeling unwell in a sauna?
People who've had alcohol in the past few hours, those who exercised heavily beforehand, anyone with a fever or infection, people on medications that affect blood pressure or sweating, and first-time sauna users are all more susceptible. If any of these apply to you, the article recommends keeping sessions to five to ten minutes and staying near the door.