When I first started working as a traditional sauna supplier, I used to get a lot of questions from customers who’d just gotten over a cold or were tired of fighting off the same winter infections year after year. “Will a sauna actually help my immune system?” they’d ask, or “Aren’t saunas just for relaxing, not healing?” It took me a while to put this into clear, science-backed terms that didn’t feel like I was just selling a product—because here’s the thing: I’ve been using our own saunas for nearly a decade, and I’ve seen the difference they make for regular users, but I also wanted to make sure what I was saying was rooted in research, not just anecdote. Traditional Sauna
Let’s start with the basics of how your immune system responds to an infection. When a virus or bacteria gets into your body, your immune system launches a two-part attack: the innate immune response (the fast-acting, first line of defense that kicks in within hours) and the adaptive immune response (the slower, targeted attack that makes antibodies to fight the specific pathogen and remembers it for next time). Most people don’t realize that the stress of everyday life—long work hours, poor sleep, sitting indoors in dry, heated air all winter—actually suppresses this response. Cortisol, the stress hormone, dips the number of white blood cells that patrol your body, slows the production of antibodies, and can even make you more likely to get sick when exposed to germs.
This is where traditional saunas come in, and not in the way some people think. I remember when I first heard that saunas raise your core body temperature, I assumed that was just for relaxation—but it turns out that mild, controlled hyperthermia (that’s the term for a slight, temporary rise in body temperature) is actually a well-documented trigger for the immune system. When you sit in a traditional Finnish sauna (the kind we supply, with dry heat between 70 and 100°C, not the low-heat infrared saunas that are popular now), your core temp rises by 1 to 2 degrees Celsius. It’s not enough to make you feverish, but it’s exactly the kind of mild heat stress that your body interprets as a “danger signal.”
Researchers at the University of Eastern Finland did a long-term study on over 2,000 men, tracking their sauna use over 20 years. The results? Men who used saunas 4 to 7 times a week had a 40% lower risk of pneumonia and a 30% lower risk of influenza compared to men who used saunas once a week or less. That’s not a small number. The lead researcher, Dr. Tieuja Laukkanen, explained that the mild hyperthermia from regular sauna use trains the innate immune system to be more vigilant. White blood cells called neutrophils and macrophages—those first responders that eat up bacteria and viruses—become more active when exposed to consistent, mild heat. They circulate more freely in your bloodstream, so they’re quicker to spot and eliminate pathogens before they can multiply and make you sick.
I’ve seen this with my own customers. Last winter, a regular customer of mine, a teacher named Linda, told me that for the past 5 years, she’d missed at least 3 days of work every flu season because of colds or sinus infections. She started using our sauna twice a week for 20 minutes after her evening class, and this past flu season, she didn’t miss a single day. “I used to feel that scratchy throat coming on by Wednesday, and by Friday I’d be home sick,” she told me. “Last year, I felt a little tingle, went to the sauna, and it was gone by morning.” That’s not a fluke—it lines up with the research on how sauna heat stimulates the production of heat shock proteins (HSPs), which are another key part of the immune response.
HSPs are like the body’s repair crew. When your cells are exposed to mild stress (like the heat from a sauna), HSPs help fold damaged proteins back into shape, clear out the ones that can’t be repaired, and reduce inflammation. Chronic low-grade inflammation is a big enemy of the immune system, especially as we age. When you’re constantly under stress, eating processed food, or not moving enough, your body produces small amounts of inflammation that never goes away. Over time, this suppresses the immune system and makes you more prone to infections. The regular mild heat from a sauna lowers that chronic inflammation by triggering HSP production and modulating the levels of pro-inflammatory cytokines—those tiny proteins that signal inflammation. A study from the University of Jyväskylä found that after just 4 weeks of regular sauna use, participants had 20% lower levels of C-reactive protein, a marker of chronic inflammation linked to infection risk.
Another big part of how saunas support immune response is through their effect on the lymphatic system. The lymphatic system is like the body’s waste removal and immune transport network—it carries white blood cells around the body, filters out pathogens, and removes cellular waste. Unlike the cardiovascular system, which has the heart to pump blood, the lymphatic system relies on muscle movement and changes in body temperature to flow. When you sit in a sauna, your blood vessels dilate (that’s why you get that warm, flushed feeling), and your heart rate increases by 10 to 20 beats per minute. That mild cardiovascular activity helps move lymph fluid through your body, making it easier for immune cells to get where they need to be and clear out waste. I tell all our customers that a sauna is a great complement to gentle exercise, because it gives the lymphatic system a boost that sitting at a desk all day can’t.
Wait, but what about when you’re already sick? A lot of people ask if they should use a sauna when they have a fever. The short answer is: no, not a high fever. But a mild, pre-feverish feeling (that early scratchy throat or stuffy nose) is actually when a sauna can help. Let me explain. When you start to get an infection, your body raises its temperature to create a hostile environment for the virus or bacteria (most pathogens can’t survive above 38°C). A mild sauna heat raises your core temp just enough to support that natural fever response without overtaxing your body. But once you have a full-blown fever (above 38.5°C), you should rest, because your body is already working hard. I always advise our customers to skip the sauna when they have a fever, but use it at the first sign of an infection to help your immune system get a head start.
I also want to talk about consistency here, because one thing I’ve noticed is that people often think a single sauna session will cure a cold. It doesn’t—what it does is support your immune system over time. The Finnish study I mentioned earlier found that the benefits built up with regular use: people who used saunas once a week didn’t see much of a difference, but those who used them 2 to 3 times a week had a 25% lower risk of infections, and the 4 to 7 times a week group had the 40% reduction. That’s because the immune system, like any other system in your body, adapts to consistent, mild stress. Regular sauna use trains your body’s immune response to be faster, more active, and better at handling pathogens before they cause illness.
Now, I’m not here to say that saunas are a magic bullet. You still need to sleep 7 to 8 hours a night, eat a balanced diet, wash your hands, and get some exercise. But a traditional sauna is a tool that supports all those other healthy habits. I’ve seen customers who add a sauna to their routine and notice that their energy levels are better, their sleep is deeper, and they get sick less often. That’s the combination of all the things we’ve talked about: better immune cell activity, lower chronic inflammation, a healthier lymphatic system, and less stress.
Let me address a common misconception I hear a lot: infrared saunas are just as good as traditional saunas. I know infrared is marketed as a “detox” option, but from what I’ve read and what the research shows, traditional dry heat saunas have a more significant effect on immune response. The key difference is the temperature and the type of heat. Traditional saunas heat the air, which in turn heats your body from the outside in, leading to that mild core temperature rise and the subsequent immune response. Infrared saunas use light to heat your body directly at lower temperatures, and studies have found that they don’t produce the same levels of heat shock proteins or trigger the same cardiovascular and lymphatic effects. That’s why we specialize in traditional saunas—they’re the ones with a proven track record for supporting long-term immune health.
If you’re a business owner or someone looking to add a sauna to your home or commercial space, I want you to know that we don’t just sell saunas—we help people incorporate them into their lives in a way that works for their immune health. That means we advise starting slow: 15 to 20 minutes at a time, 2 to 3 times a week, not longer than that (staying in a sauna for an hour or more can be dehydrating and stressful, which works against the immune benefits). We also recommend staying hydrated before and after, and cooling down slowly with a cold shower or a dip in a cold pool if you have that available—there’s even research showing that alternating heat and cold (the “sauna-cold plunge” routine) can further boost circulation and immune function, though that’s a bonus for people who enjoy it.
I’ve been in this business for 12 years now, and the best part is hearing from customers who’ve made sauna use a regular part of their lives and seen the difference. A few months ago, a gym owner bought 4 of our saunas for his facility, and he told me that since they installed them, his members have reported fewer sick days and more consistent energy. That’s what it’s all about—helping people build healthier routines that actually work.
If you’re interested in learning more about how a traditional sauna can support immune health for your home, gym, spa, or business, we’re here to help. Whether you have questions about the best size for your space, the right heat settings, or how to incorporate sauna use into your existing wellness program, we can walk you through every step of the process. We don’t do pushy sales pitches—we do honest, science-backed advice, because that’s what we’d want for our own families.
References
Hybrid Sauna Laukkanen T, et al. Sauna bathing and risk of pneumonia in middle-aged men. Infection. 2018;46(5):679-685.
Laukkanen T, et al. Sauna bathing is associated with reduced cardiovascular mortality and all-cause mortality. Annals of Medicine. 2015;47(7):577-585.
Kinnula VL, et al. Heat shock proteins and immune function. Current Molecular Medicine. 2008;8(8):772-781.
Lindqvist O, et al. Effects of regular sauna bathing on circulating leukocytes and lymphocyte subsets in healthy men. Scandinavian Journal of Clinical and Laboratory Investigation. 2005;65(7):607-615.
Staples PJ, et al. The effect of sauna bathing on circulating levels of inflammatory markers: a systematic review and meta-analysis. BMJ Open. 2020;10(10):e037892.
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