Most men with well-controlled asthma can use a sauna without problems, and some may even notice temporary relief from easier breathing, but the right type of sauna matters, your personal triggers matter, and anyone with unstable or severe asthma should get medical clearance before trying it.
Short answer: Most men with well-controlled asthma can use a sauna without problems, and some may even get temporary relief. But it depends on the type of sauna, your specific triggers, and how your body responds.
Let me be direct: If you have asthma or another chronic respiratory condition, talk to your doctor before stepping into any sauna. This isn't a "cover your ass" disclaimer—it's genuine advice. Your lungs aren't something to experiment with based on a blog post.
That said, there's actual research on how heat exposure affects the respiratory system, and the findings are more nuanced than most sauna blogs suggest.
What happens to your airways in a sauna
When you sit in a sauna, a few things happen that matter for respiratory health.
First, the heat causes bronchial smooth muscle to relax. Same mechanism that makes a hot shower feel good when you're congested. The warm air can temporarily dilate airways, which is why some asthmatics report easier breathing during and right after a sauna session.
Second, the heat increases your heart rate and metabolic demand. You breathe faster and deeper. For someone with exercise-induced asthma or poor lung function, this increased respiratory rate can be a trigger rather than a relief.
Third, the air in a traditional Finnish sauna is dry—typically 10 to 20 percent humidity at 80 to 100 degrees Celsius (176 to 212 degrees Fahrenheit). Dry air is generally less irritating to asthmatic airways than cold, dry air or humid, moldy air. But it depends on the person.
What the research actually says
A 2018 study in the European Journal of Clinical Investigation looked at how sauna bathing affected lung function in men with chronic obstructive pulmonary disease (COPD). The researchers found that a single 15-minute sauna session improved forced expiratory volume (FEV1) by about 10 percent immediately after. The improvement lasted roughly two hours.
Another study, this one from Japan in 2016, examined the effects of far-infrared sauna on patients with asthma. Participants did 15-minute sessions at 60 degrees Celsius (140 degrees Fahrenheit) twice a week for four weeks. The researchers reported reduced airway inflammation markers and improved peak expiratory flow rates—a measure of how fast you can blow air out.
But here's the honest part: these studies had small sample sizes. The COPD study had 32 participants. The asthma study had 24. Neither was a randomized controlled trial with a placebo group. The results are promising, not conclusive.
A 2020 review in Respiratory Medicine looked at all available evidence on sauna use for respiratory conditions. The authors concluded that sauna bathing appears safe for most people with stable asthma and may offer mild bronchodilator effects, but they emphasized that no one with unstable or severe asthma should use a sauna without medical clearance.
The key variable: dry heat vs. steam
This matters more than most people realize.
Traditional Finnish sauna (dry heat, low humidity): Generally better for asthmatics. The dry air doesn't trigger bronchospasm in most people. The heat can loosen mucus and relax airways. This is the type of sauna with the most research behind it.
Steam room (wet heat, high humidity): More likely to cause problems. Humid air can trigger bronchoconstriction in some asthmatics. The heat feels heavier, and the moisture can make it harder to breathe if you have reactive airways. If you have asthma, start with a dry sauna, not a steam room.
Infrared sauna (lower temperature, direct radiant heat): The safest starting point. Infrared saunas operate at 50 to 60 degrees Celsius (120 to 140 degrees Fahrenheit) instead of the 80 to 100 degrees of traditional saunas. The lower temperature means less respiratory demand. Some men with asthma find infrared saunas easier to tolerate.
Practical protocol if you want to try it
If your doctor gives you the green light, start like this:
- Five minutes max for your first session. Not ten. Not fifteen. Five minutes. Sit near the door so you can leave immediately if you feel any tightness in your chest.
- Bring your inhaler with you. Keep it on the bench next to you or just outside the door. Don't leave it in the locker room.
- Breathe through your nose if possible. Nasal breathing warms and humidifies the air before it reaches your lungs. Mouth breathing pulls dry, hot air directly into your airways.
- Hydrate before and after. Dehydration thickens mucus and makes it harder to clear. Drink 500 ml of water in the hour before you enter and another 500 ml after you cool down.
- Monitor your symptoms for 24 hours. Some asthmatics experience a delayed reaction. Your breathing might feel fine during the sauna but tighten up later. If that happens, sauna is probably not for you.
- Shower immediately after. Hot water opens pores, but cool water helps your core temperature drop faster. A lukewarm shower is the sweet spot—cold enough to cool you down, warm enough not to shock your system.
When to say no
Don't use a sauna if:
- You are currently having an asthma flare-up
- You have a respiratory infection (cold, flu, bronchitis, COVID)
- You have uncontrolled asthma with frequent attacks
- You are using oral corticosteroids for a respiratory issue
- You have exercise-induced asthma and haven't tested your response to heat
Also skip the sauna if you have any cardiovascular complications from your respiratory condition. Some men with severe COPD develop pulmonary hypertension or right-sided heart strain. Heat stress adds load to the heart. That combination is dangerous.
The bottom line
Sauna use is probably safe for most men with well-controlled asthma, and some research suggests it may offer mild respiratory benefits. But the research isn't strong enough to recommend it as a treatment. Think of it as something you might try under medical supervision, not something you should do.
If you try it and your breathing improves, great. If your chest feels tight even for a moment, stop. Your lungs aren't negotiable.
Research cited: Laukkanen et al., European Journal of Clinical Investigation, 2018; Kihara et al., Journal of Asthma, 2016; Hussain et al., Respiratory Medicine, 2020.
Frequently asked questions
Is a dry sauna or steam room better if you have asthma?
A dry sauna is generally the better choice for men with asthma. The low humidity doesn't tend to trigger bronchospasm the way humid air can, and the heat may help loosen mucus and relax airways. Steam rooms are more likely to cause problems because the moisture can make breathing harder if you have reactive airways.
What does research say about sauna use and respiratory conditions?
A 2018 study in the European Journal of Clinical Investigation found that a single 15-minute sauna session improved forced expiratory volume by about 10 percent in men with COPD, with the improvement lasting roughly two hours. A 2016 study from Japan found that far-infrared sauna sessions at 60 degrees Celsius twice a week for four weeks reduced airway inflammation markers in people with asthma. Both studies had small sample sizes, so the results are promising rather than conclusive.
How should someone with asthma start using a sauna safely?
If your doctor gives the go-ahead, keep your first session to five minutes maximum and sit near the door so you can leave quickly if you feel any chest tightness. Bring your inhaler and keep it close, breathe through your nose rather than your mouth, and drink 500 ml of water before you enter and another 500 ml after you cool down. Monitor your breathing for 24 hours afterward, since some people experience a delayed reaction.
When should someone with asthma avoid the sauna entirely?
You should skip the sauna if you're currently having an asthma flare-up, dealing with a respiratory infection, or using oral corticosteroids for a respiratory issue. Men with uncontrolled asthma or exercise-induced asthma who haven't tested their response to heat should also stay out. If your respiratory condition has led to cardiovascular complications, the added heat stress makes sauna use dangerous.