Are Saunas Good for You? 9 Research-Backed Benefits

Short answer: yes. A 20-year study tracking over 2,300 men found that frequent sauna users had a 40% lower risk of dying from any cause. That's not a marginal improvement. That's one of the strongest lifestyle interventions researchers have ever documented.

But most sauna guides bury the practical stuff: how hot, how long, what actually to do when you sit down. This guide covers the research and the routine so you can start using a sauna with confidence, whether it's your first session or your fiftieth.

What Is a Sauna and How Does It Work?

A sauna is a heated room, typically between 65 °C and 100°C, designed to make you sweat. That's the simple version. What's happening inside your body is more interesting.

When you step into a sauna, your core temperature starts climbing within minutes. Your heart rate increases from a resting ~60-80 bpm up to 100-150 bpm, roughly the same cardiovascular demand as a brisk walk or light jog. Cardiac output jumps by 60-70% as your heart works harder to push blood toward the skin's surface to cool you down.

Your blood vessels dilate, improving circulation throughout your body. You start producing heat shock proteins (HSPs), specialized molecules that repair damaged cells and protect healthy ones. And you sweat—a lot. The average person loses about a pint of sweat during a 15-minute session.

This combination of cardiovascular stress, cellular repair, and thermoregulation drives the health benefits outlined below. Your body treats a sauna session like mild exercise, and it adapts accordingly.

Types of Saunas Explained

Not all saunas work the same way. The type you use affects the temperature, session length, and overall experience, so it's worth understanding the differences before you get started.

Traditional (Finnish) Saunas

The original. A traditional sauna heats the air using a wood-burning, electric, or gas heater, usually with a pile of rocks on top. Pour water over the rocks, and you get a burst of steam called "loyly" – that's what cranks up the humidity and intensity.

Temperature range: 65–90°C with low humidity (10-20%, spiking when you add water). This is the most-studied sauna type. The majority of the research cited in this guide comes from traditional sauna use.

Our Sauna Cube range falls into this category: outdoor units with Thermowood construction built for year-round use.

Infrared Saunas

Infrared saunas use light waves to heat your body directly rather than heating the air around you. The result is a lower ambient temperature (49–65°C) with no added humidity, which many people find more comfortable, especially if high heat isn't your thing.

Sessions can run longer (30-45 minutes) because the overall heat stress is gentler. The research base is growing but remains smaller than that for traditional saunas. Our Nova and Eclipse infrared saunas come with built-in Bluetooth and LED lighting so that you can try infrared at home.

Steam Rooms vs Saunas

Steam rooms operate at lower temperatures (43–49°C) but at near-100 % humidity, which makes them feel hotter than they are. The benefits overlap with traditional saunas, including improved circulation, stress relief, and respiratory benefits. Still, the experience is different enough that people tend to have a strong preference for one or the other.

For a more detailed comparison, check out our breakdown of steam rooms vs saunas.

9 Research-Backed Health Benefits of Sauna Use

1. Improved Heart Health

This is the most well-documented sauna benefit, and it's not close. A landmark 20-year Finnish study led by Dr. Jari Laukkanen tracked 2,315 middle-aged men and found that those who used a sauna 4-7 times per week had:

• 63% lower risk of sudden cardiac death
• 48% lower risk of fatal coronary heart disease
• 50% lower risk of fatal cardiovascular disease

This is compared to men who used a sauna just once per week. The study was published in JAMA Internal Medicine and has been cited in hundreds of subsequent papers.

The mechanism is straightforward: sauna use mimics moderate cardiovascular exercise. Your heart rate rises, blood vessels dilate, and blood pressure drops. Regular sauna users see systolic blood pressure reductions of 5-10 mmHg, comparable to some first-line blood pressure medications.

2. Stress Relief and Mental Health

Heat exposure triggers a cascade of feel-good chemistry. Your body releases endorphins, reduces cortisol levels, and activates the parasympathetic nervous system – the "rest and digest" mode that counteracts chronic stress.

The data here is compelling. Research published in Psychosomatic Medicine found that a single session of whole-body heating reduced depression symptoms by up to 50%, with effects lasting up to six weeks. A 2025 clinical trial at UCSF expanded on this, showing that whole-body heating combined with cognitive behavioral therapy produced meaningful reductions in major depressive disorder symptoms for the majority of participants.

This doesn't mean a sauna replaces therapy or medication. But as a tool for managing everyday stress and supporting mental health, the evidence is hard to ignore.

3. Better Sleep

If you struggle with sleep, timing a sauna session 1-2 hours before bed may help. Research shows a single session can improve deep sleep by up to 70%.

The mechanism: your body temperature rises during the sauna, then drops rapidly after you step out. That drop mimics the natural thermoregulation cycle your body goes through as it prepares for sleep, essentially giving your brain a stronger "time to sleep" signal. The key is finishing your session early enough that your core temperature has time to come back down before you get into bed.

4. Muscle Recovery and Athletic Performance

This one matters if you train regularly. Sauna use after exercise triggers heat shock protein production, which accelerates the repair of damaged muscle tissue and reduces delayed onset muscle soreness (DOMS) within 24-48 hours.

But the performance data is what stands out. A study on distance runners found that adding regular post-run sauna sessions produced a 32% increase in time to exhaustion, a 7.1% increase in plasma volume, and a 3.5% increase in red blood cell count. Those are significant adaptations, the kind athletes normally chase through altitude training.

If you're already training and want to accelerate recovery, pairing workouts with a home sauna removes the barrier of having to go to a gym or spa.

5. Immune System Boost

A study published in the Annals of Medicine found that regular sauna users caught roughly 50% fewer common colds over three months compared to non-users. The proposed mechanism: heat stress stimulates white blood cell production, your body's frontline defense against infection.

There's also some evidence of respiratory benefits: the warm, humid air (especially in traditional saunas with water on the rocks) can help open airways and improve breathing. That’s why some people find saunas helpful during cold and flu season.

6. Reduced Inflammation

Chronic low-grade inflammation is linked to heart disease, diabetes, arthritis, and most other diseases that shorten life spans. Regular sauna use has been shown to lower C-reactive protein (CRP), a key biomarker doctors use to measure systemic inflammation.

This is particularly relevant for people dealing with arthritis, rheumatoid arthritis, or fibromyalgia. The combination of heat, improved circulation, and reduced inflammatory markers can provide meaningful relief from joint and muscle pain. That said, if you have an active inflammatory condition, check with your doctor before starting.

7. Skin Health (and the Detox Reality Check)

Increased blood flow during a sauna session delivers more oxygen and nutrients to your skin, which supports cell turnover and gives you that post-sauna glow. Sweating also helps flush surface-level dirt and oil from the pores.

Here's where it's important to be honest: saunas aren't a "detox" in any meaningful medical sense. Your liver and kidneys handle detoxification. Sweat is about 99% water with trace amounts of minerals and very small quantities of heavy metals. The skin benefits come from improved circulation, not from "sweating out toxins." Any guide that tells you otherwise is selling something.

8. Brain Health and Cognitive Function

The same Finnish research group that produced the cardiovascular findings also studied cognitive outcomes – in a study of nearly 14,000 adults, frequent sauna users (4-7 sessions per week) had a 65% lower risk of developing Alzheimer's disease and dementia compared to those who used a sauna once per week.

The likely mechanisms include improved vascular function to the brain and increased production of brain-derived neurotrophic factor (BDNF), a protein that supports the growth and survival of neurons. This is still an active area of research, but the correlation is strong enough to note.

9. Longevity

This is less a standalone benefit and more the compound result of everything above. The Finnish longitudinal data showed a 40% reduction in all-cause mortality for people who used a sauna 4-7 times per week compared to once per week.

Better cardiovascular function, lower inflammation, improved sleep, reduced stress, stronger immune response - stack those up over years and decades, and the longevity data starts making sense. Sauna use isn't a magic bullet. But as a daily habit with cumulative benefits, the evidence puts it in rare company.

How Long Should You Stay in a Sauna?

This depends on two things: the type of sauna you're using and your level of experience.

By Sauna Type

• Traditional Finnish sauna: 15-20 minutes per session
• Infrared sauna: 20-40 minutes (lower temperature allows for longer sessions)
• Steam room: 15-20 minutes
• Portable/personal sauna: 20-30 minutes

By Experience Level

If you're new to sauna use, don't jump straight to 20-minute sessions at full heat. Build up gradually:

• Complete beginner (weeks 1-2): Start with 5-10 minutes, once or twice a week. Sit on the lower bench where it's cooler.
• Intermediate (weeks 3-4): Work up to 15-20 minutes, 3-4 times per week. Move to the upper bench.
• Experienced (week 5+): 20-30 minutes, 4-7 times per week. You'll know your limits by now.

The research sweet spot, where the best health outcomes occur, is 15-20 minutes per session, 3-7 times per week. Never exceed 30 minutes in a traditional sauna, and always listen to your body. If you feel dizzy, nauseous, or lightheaded, get out immediately.

Sauna Temperature Guide

A useful rule for beginners: increase either the temperature or the session duration each week, not both at the same time. Add 5 degrees or 5 extra minutes, and give your body time to adapt before pushing further.

For a deeper look at how to actually use a sauna from setup to cooldown, we put together a practical walkthrough.

How to Use a Sauna: A Step-by-Step Beginner's Guide

Most sauna guides list the benefits and stop there. Here's the practical protocol you can follow from your very first session.

Before Your Session

Drink 16-20 oz of water an hour before you go in. Dehydration is the number one reason people feel awful in a sauna, and it's entirely preventable.

Take a quick shower beforehand. This removes oils and lotions from your skin (which can interfere with sweating) and helps your pores open up. Skip heavy meals for 1-2 hours before your session. A full stomach and high heat don't mix well.

What to wear: a towel, swimsuit, or nothing at all, depending on the setting. If you're using a home sauna, light cotton or just a towel works fine.

During Your Session

Sit on a towel for hygiene and comfort. If the heat feels intense, start on the lower bench; heat rises, so the temperature difference between the top and bottom benches can be 20-30 degrees.

Breathe normally. You don't need any special breathing technique for your first time. Just relax. If you feel dizzy, nauseous, or like your heart is racing uncomfortably, leave the sauna immediately. There's no prize for toughing it out.

After Your Session

Cool down gradually. A cool (not ice cold) shower works, or just sit outside for 5-10 minutes and let your body temperature come down naturally.

Rehydrate with at least 12-16 oz of water. If your session went longer than 20 minutes, add electrolytes; you lose more than just water through sweat.

Wait 10-15 minutes before any intense physical activity. Your cardiovascular system is still working hard to regulate your temperature, and stacking heavy exercise on top of that isn't ideal.

Sauna and Cold Plunge: The Contrast Therapy Combo

If you've seen the ice bath trend and wondered how it connects to saunas, this is it. Contrast therapy alternates between heat exposure (sauna) and cold exposure (cold plunge or ice bath) to amplify the benefits of both.

The basic protocol:

1. Sauna for 15-20 minutes
2. Cold plunge for 2-3 minutes at 7–13°C
3. Rest for 2-3 minutes
4. Repeat for 2-3 rounds total

The hot-cold cycle drives a powerful circulatory response: blood vessels dilate in heat, then constrict in cold, creating a "pump" effect that flushes metabolic waste from muscles and delivers fresh, oxygenated blood. Cold exposure also triggers a sharp spike in norepinephrine, which improves alertness, mood, and focus.

We sell both saunas and cold plunge tubs, so you can build a full contrast therapy setup at home without piecing it together from different brands. If you're already doing ice baths, adding a sauna is the natural next step, and vice versa. For more on the cold side of the equation, read up on how cold water immersion boosts physical and mental health.

Home Sauna vs Gym or Spa: Which Is Right for You?

Here's the practical question most beginners face: Should you invest in a home sauna, or just use the one at your gym?

The research is detailed that frequency matters. The best health outcomes occur with 4-7 sessions per week. If you're relying on a gym sauna, that means getting to the gym nearly every day, waiting for availability, and fitting in sessions around the gym's schedule and other members' schedules. For most people, that frequency drops off fast.

A home sauna removes every friction point. You control the temperature, the schedule, the music, and who's in there with you – no commute, no waiting, no sharing a bench with a stranger on their phone.

The cost math is simpler than people think. A gym membership with sauna access costs $50-$100/month or $600-$1,200 per year. Regular spa visits for sauna access can add up to $2,400+ annually. A home sauna is a one-time investment that pays for itself within a few years of consistent use.

We designed our range to cover multiple price points and space requirements. The Portable Steam Sauna is the entry-level option: foldable, compact, and no installation required. Our infrared sauna range is designed for indoor use, with models for 1-4 people. And the Sauna Cube and Sauna Cube XL are full outdoor units for people who want the traditional Finnish experience at home.

If you're handy, we also have a guide on building your own sauna.

Who Should Avoid Sauna Use

Saunas are safe for most healthy adults, but certain groups should check with a doctor first:

• Pregnant women; the effects of sustained high heat on fetal development aren't fully understood
• People with uncontrolled high or low blood pressure
• Anyone taking medications that affect heart rate, blood pressure, or heat regulation
• People who've had a recent heart attack, stroke, or cardiac event
• Anyone currently dehydrated or under the influence of alcohol

Warning signs to exit the sauna immediately: dizziness, nausea, confusion, rapid or irregular heartbeat, or a feeling that something is "off." These aren't normal parts of the sauna experience, and pushing through them is dangerous.

If you have any chronic health conditions, talk to your doctor before starting a sauna routine. This isn't a legal disclaimer, but common sense.

Key Takeaways

• Regular sauna use (3-7x per week, 15-20 minutes) is linked to a 40% reduction in all-cause mortality and a 63% lower risk of sudden cardiac death.
• The biggest documented benefits are cardiovascular, but mental health, sleep, recovery, immune function, and brain health all have strong supporting research.
• Traditional saunas (66–91°C) have the deepest evidence base; infrared saunas (49–65°C) are a gentler alternative with a growing body of research.
• Beginners should start at 5-10 minutes and build up gradually over 4-6 weeks.
• Contrast therapy (sauna + cold plunge) amplifies circulatory and recovery benefits.
• A home sauna removes the frequency barrier that keeps most people from hitting the 4-7x/week sweet spot.
• Always hydrate before and after, and never push through dizziness or nausea.

Frequently Asked Questions

Can you use a sauna every day?

Yes, if you're healthy, hydrated, and have built up your heat tolerance over a few weeks. Finnish people commonly use a sauna daily, and research shows the best health outcomes come from the 4-7 sessions-per-week group. Just don't jump to daily use from zero. Build up over 4-6 weeks.

Should you sauna before or after a workout?

After is better for most people. Post-workout sauna use enhances recovery by increasing blood flow to fatigued muscles and triggering heat shock protein production. Using a sauna before exercise can impair performance by raising your core temperature and dehydrating you before you've even started training.

Do saunas help you lose weight?

You'll lose water weight through sweat, sometimes several pounds in a single session, but that weight comes right back when you rehydrate. Saunas don't burn fat directly. The indirect weight-management benefits stem from improved sleep quality, lower stress hormone levels, and better recovery, all of which support a healthy metabolism over time.

Is an infrared or a traditional sauna better?

Neither is objectively superior. Traditional saunas have a much larger body of research behind them and deliver higher heat stress, which drives stronger cardiovascular adaptations. Infrared saunas are more accessible - lower temperatures, longer sessions, and easier to install at home. Both deliver real benefits. The best sauna is the one you'll actually use consistently.

Can you bring your phone into a sauna?

It's not recommended. Most phones aren't rated for temperatures above 35–45°C, and sustained exposure to sauna-level heat (49–91°C) can damage the battery, screen, and internal components. Beyond the hardware risk, the point of a sauna session is to disconnect and let your nervous system downregulate. Leave the phone outside.

How much water should you drink before and after a sauna?

Drink 16-20 oz of water an hour before your session and at least 12-16 oz afterward. For sessions over 20 minutes, consider adding electrolytes to your post-sauna hydration. The average person loses about a pint of sweat per 15 minutes of sauna use, so you need to replace that fluid.

Is sauna safe during pregnancy?

Medical guidance on this is cautious. Sustained core temperature increases above 101F may pose risks during pregnancy, and saunas can push core temperature well beyond that. Most OBGYNs recommend avoiding saunas during pregnancy or limiting exposure to very short, low-temperature sessions. Always consult your doctor; this isn't an area to guess on.

What's the difference between a sauna and a steam room?

A sauna uses dry heat (66–91°C, 10-20% humidity), while a steam room uses wet heat (43–49°C, ~100% humidity). Both improve circulation and promote relaxation, but the experience is quite different. Saunas feel like dry, intense heat. Steam rooms feel heavy and humid. Many people find saunas more tolerable at higher temperatures because the low humidity makes the heat easier to manage.

How soon will I notice the benefits of the sauna?

Most people notice stress reduction and improved sleep quality within the first week or two of regular use. Cardiovascular adaptations, improved recovery, and immune benefits develop over 4-8 weeks of consistent use. The major longitudinal benefits, such as reduced mortality and cognitive protection, are measured in years. Consistency is what matters most.