Sauna therapy may offer modest support for respiratory function through bronchodilation and reduced systemic inflammation, but it is not a substitute for medical care and will not resolve the underlying condition causing asthma or other chronic respiratory issues.
Short answer: Research suggests sauna therapy may support better respiratory function, but it is not a treatment or cure for asthma. If you have asthma or another chronic respiratory condition, you need to be careful about how you approach heat exposure.
Let me explain what the science actually shows and what it means for someone with breathing issues.
What happens to your airways in a sauna
When you sit in a sauna, several things happen to your respiratory system at once.
The heat causes your airways to dilate. This is called bronchodilation, and it is the same mechanism that happens when you use a rescue inhaler, just triggered by a different signal. The warm air relaxes the smooth muscle around your bronchial tubes, which can temporarily improve airflow.
At the same time, the heat increases your heart rate and breathing rate. Your body is working to cool itself, and that requires moving more oxygen. Most people experience a 20 to 30 percent increase in ventilation rate during a sauna session.
The third effect is on mucus. Heat and humidity can thin respiratory secretions, making them easier to clear. This is why people with congestion often feel temporarily better after a sauna.
A 2018 study in the European Journal of Epidemiology followed 1,600 Finnish men for 15 years and found that men who used a sauna 2 to 3 times per week had a 27 percent lower risk of developing pneumonia compared to men who used a sauna once per week or less. The men who used a sauna 4 to 7 times per week had a 41 percent lower risk.
That is an association, not proof of causation. But it is worth noting.
The asthma-specific research
The research on sauna and asthma is limited but interesting.
A 2013 study in the European Journal of Clinical Investigation looked at asthmatic patients who used a sauna twice per week for six weeks. The researchers measured lung function before and after the intervention. They found modest improvements in forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), both standard measures of lung function.
The improvements were not large enough to suggest sauna could replace medication. But they were statistically significant.
Another study from Japan examined the effects of far-infrared sauna on patients with chronic obstructive pulmonary disease (COPD). After four weeks of regular sauna use, participants reported less shortness of breath during daily activities and showed improved exercise tolerance.
The mechanism researchers point to is improved cardiovascular efficiency. When your heart and blood vessels work better, your lungs do not have to work as hard to oxygenate your blood. Sauna use improves endothelial function and increases stroke volume, which means each heartbeat pumps more blood. That reduces the demand on your respiratory system.
The problem with dry heat and asthma
Here is where it gets complicated.
Traditional Finnish saunas are dry. Humidity is typically between 10 and 20 percent. For some people with asthma, dry air can trigger bronchoconstriction, the opposite of what you want.
A 2010 review in the Journal of Asthma noted that while some asthmatics tolerate dry sauna well, others experience coughing or wheezing during sessions. The response appears to be individual.
Steam rooms present a different set of risks. The high humidity can be problematic for people with asthma triggered by mold or dust mites, since those allergens thrive in damp environments. Steam rooms also tend to be hotter in a different way, with less control over temperature.
Infrared saunas operate at lower temperatures, typically 120 to 140 degrees Fahrenheit compared to 175 to 195 for traditional saunas. Some people with respiratory sensitivity find infrared more tolerable because the air is less hot and dry. The lower temperature also means less stress on the cardiovascular system, which can matter if your asthma is exercise-induced or stress-sensitive.
What the research does not say
No study has shown that sauna therapy can prevent asthma attacks, reduce reliance on medication, or reverse lung damage. Anyone claiming otherwise is selling something.
Asthma is a chronic inflammatory condition of the airways. Sauna use may temporarily reduce systemic inflammation through the release of heat shock proteins and improved circulation, but it does not address the underlying immune dysfunction that causes asthma.
If you have asthma, sauna should be viewed as a potential supportive practice, not a treatment.
Practical protocol for men with respiratory issues
If you want to try sauna therapy and you have asthma or another respiratory condition, here is a conservative approach based on what the research suggests.
- Start with short sessions. Five to eight minutes is enough to see how your body responds. Do not push through coughing or chest tightness. If your symptoms get worse, stop.
- Keep the temperature moderate. 150 degrees Fahrenheit is a reasonable starting point for a traditional sauna. For infrared, 120 to 130 degrees.
- Hydrate before and after. Dehydration thickens mucus, which is the opposite of what you want. Drink water before you enter the sauna and after you exit.
- Monitor your breathing during the session. If you feel your airways tightening, leave immediately. Cool air will help reverse bronchoconstriction faster than staying in the heat.
- Do not use a sauna during an active asthma flare. Wait until your symptoms are under control. Heat stress on top of respiratory distress is not smart.
- Consider using your inhaler before a session if your doctor has approved that approach. Some men with exercise-induced asthma find that pre-treating with a bronchodilator makes sauna use more comfortable.
- Shower after the sauna. This is not just about hygiene. A cool shower helps bring your core temperature down gradually and can help prevent post-sauna coughing fits.
Who should avoid sauna entirely
Sauna use is not safe for everyone with respiratory issues.
Men with severe or uncontrolled asthma should not use sauna without explicit medical clearance. The same goes for anyone with COPD requiring supplemental oxygen, a history of spontaneous pneumothorax (collapsed lung), or recent respiratory infection with fever.
If you have any doubt about whether sauna is safe for you, ask your pulmonologist or primary care doctor. One conversation is better than one emergency room visit.
The bottom line
Sauna therapy may offer modest benefits for respiratory function through bronchodilation, improved circulation, and reduced systemic inflammation. The epidemiological data on reduced pneumonia risk is compelling. But sauna is not a treatment for asthma.
Think of it this way. If you have asthma, sauna might make your breathing feel easier for a few hours. That is a real effect. But it does not change the underlying condition. You still need your medication. You still need to see your doctor. You still need to avoid your triggers.
The men who get the most from sauna for respiratory health are the ones who use it as one tool among many, not as a replacement for medical care.
If you decide to try it, start slow, pay attention to how your body responds, and do not ignore the warning signs. Your lungs will tell you what works.
Frequently asked questions
Can sitting in a sauna help with asthma symptoms?
Heat in a sauna can cause the airways to dilate temporarily, a process called bronchodilation, which may make breathing feel easier for a few hours. Research has found modest improvements in standard lung function measures in asthmatic patients who used a sauna twice per week for six weeks. However, those improvements were not large enough to suggest sauna could replace medication, and some people with asthma find dry heat triggers coughing or wheezing instead.
Is a traditional sauna or an infrared sauna better if you have breathing problems?
Traditional Finnish saunas tend to be dry, with humidity typically between 10 and 20 percent, which can trigger bronchoconstriction in some people with asthma. Infrared saunas operate at lower temperatures and some people with respiratory sensitivity find them more tolerable because the air is less hot and dry. The response is individual, so starting with short sessions at a moderate temperature is the safest approach.
Does sauna use lower the risk of getting pneumonia?
A 2018 study in the European Journal of Epidemiology followed 1,600 Finnish men for 15 years and found that men who used a sauna two to three times per week had a 27 percent lower risk of developing pneumonia compared to men who used a sauna once per week or less. Men who used a sauna four to seven times per week had a 41 percent lower risk. The researchers noted this is an association, not proof of causation.
Who should avoid sauna if they have a respiratory condition?
Men with severe or uncontrolled asthma should not use a sauna without explicit medical clearance. Anyone with COPD requiring supplemental oxygen, a history of collapsed lung, or a recent respiratory infection with fever should also stay out. If there is any doubt about whether sauna is safe, speaking with a pulmonologist or primary care doctor is the right first step.