Sauna When Sick: What to Know Before You Go

Woman wrapped in white towel sitting in a steam sauna, appearing calm and reflective — symbolizing rest and recovery while sick

Last Updated: April 2026

Using a sauna when sick is one of the more common questions in the wellness space — and the honest answer is: it depends on what you have and how you feel. For mild symptoms like early-stage congestion or general fatigue, a gentle infrared session may be tolerable and some people find it supportive. For anything involving fever, active infection, or feeling genuinely unwell, rest is the better call. This guide walks through the key considerations so you can make an informed decision.

Can a Sauna Help When You’re Sick?

Saunas provide a warm, humid environment that can offer temporary relief from cold and flu symptoms. Here’s how they might help:

  • Warmth and sweating: Gentle heat raises core temperature and promotes sweating, which some people find temporarily relieving during mild cold symptoms.
  • Clearing Congestion: Sauna air and steam inhalation can open up nasal passages and relieve sinus pressure.
  • Circulation: Heat increases heart rate and blood flow — the same mechanism that supports general recovery in healthy individuals.
  • Consistency over time: Regular sauna practice as part of a general wellness routine is associated with various markers of resilience — though this applies to established practice, not acute illness intervention.

Curious how hot your sauna should be to stay safe when you’re feeling under the weather? Explore our complete guide on sauna temperatures for all ages and types.

Sauna When Sick with a Cold

A common cold — with symptoms like a runny nose, nasal congestion, mild sore throat, or sneezing — is the scenario where sauna use is most likely to help rather than harm.

Here’s why: the warm, dry air of a sauna (or the moist air of a steam room) can temporarily open nasal passages, loosen mucus, and make breathing feel easier. The increase in core body temperature also mimics a mild fever response — a normal physiological reaction to heat that your body is well-adapted to.

For cold symptoms specifically:

  • Keep sessions short — 10 to 15 minutes maximum
  • Use a lower temperature than your normal session (110–120°F / 43–49°C for infrared, or 140–150°F / 60–65°C for traditional)
  • Hydrate more than usual — you’re already losing fluids from congestion and immune activity
  • Listen to your body — if you feel worse instead of better after 5 minutes, step out

Infrared saunas tend to work especially well here because they operate at lower air temperatures while still raising your core temperature effectively. You get the core-warming benefit without the overwhelming intensity of a traditional sauna, which can feel harsh on inflamed airways.

If you have a home sauna, this is one of its practical advantages — you can take a gentle 10-minute session without exposing anyone else to your cold, and without the hassle of getting to a gym or spa when you’re already feeling drained.

For more on how infrared heat compares to traditional in situations like these, see Infrared vs Traditional Sauna: Full Comparison & Benefits.

Sauna with a Fever: Why You Should Skip It

If your body temperature is already elevated from a fever, adding external heat from a sauna is counterproductive. Your body raises its temperature as part of its immune defense — but it also needs the ability to regulate and bring that temperature back down. A sauna interferes with that regulation.

Using a sauna with a fever increases the risk of:

  • Dangerous overheating (hyperthermia)
  • Severe dehydration, since fever already depletes fluids
  • Increased cardiovascular strain — your heart is already working harder to manage the elevated temperature
  • Dizziness, fainting, or heat exhaustion

The general rule: if your temperature is above 100.4°F (38°C), skip the sauna entirely. Rest, hydrate, and give your body the space to recover naturally. You can return to your normal sauna routine once your temperature has been normal for at least 24 hours.

This applies to all sauna types — infrared, traditional, and steam.

Sauna When Sick with the Flu or COVID-19

The flu and COVID-19 are both more systemically demanding than a common cold. They typically involve fever, body aches, fatigue, and in many cases, respiratory inflammation that extends deeper than nasal congestion.

For flu and COVID specifically, the recommendation is straightforward: skip the sauna until you’ve fully recovered. Here’s why:

  • Both illnesses commonly produce fever, which makes sauna use unsafe (see above)
  • The cardiovascular strain of heat exposure, combined with the cardiovascular stress these viruses place on your body, creates compounded risk
  • If you’re using a public or shared sauna, you risk spreading the illness to others — both flu and COVID remain contagious for several days after symptoms begin
  • Fatigue and dehydration from illness are worsened, not helped, by heat exposure

The sauna is a recovery and prevention tool — not a treatment for active systemic illness. Regular sauna use between illnesses may support immune resilience over time, but using it during an active flu or COVID infection is more likely to set you back than speed you up.

Once you’ve been fever-free for 24–48 hours and your energy levels are returning to normal, you can ease back into sauna sessions. Start with shorter durations (10 minutes) at lower temperatures and gradually return to your normal routine over a few days.

For a broader look at how regular sauna use supports immune health, see 8 Incredible Infrared Sauna Benefits for Your Health.

How Your Body Reacts in the Sauna

When you step into a sauna, your body undergoes several physiological changes:

  • Increases Your Body Temperature: Heat raises core temperature and triggers vasodilation — the same physiological response that occurs during light aerobic exercise.
  • Raises Heart Rate: Similar to moderate exercise, sauna use increases circulation and heart rate — a normal physiological response to heat.
  • Dilates Blood Vessels: The warmth causes blood vessels to expand, improving blood flow and promoting muscle relaxation.
  • Stimulates Endorphin Release: Heat exposure triggers the release of endorphins, which can help reduce stress and discomfort.
  • Steam and warmth: The warm, humid environment of certain sauna types may provide temporary comfort for those with mild nasal congestion — though this is a comfort observation, not a medical claim.

These physiological changes are part of why many people incorporate sauna sessions into their workout recovery. Find out whether it’s better to use a sauna before or after exercise.

Looking for the Right Sauna to Support Your Wellness?

Whether you’re building a consistent wellness practice or exploring how infrared heat fits into your routine, our Infrared Sauna Buyer’s Guide walks you through everything you need to know.

Get the Free Guide Now

Potential Risks of Using a Sauna When Sick

While saunas have health benefits, they may not always be a good idea when you’re sick. Consider these risks before entering a sauna:

  • Dehydration: Fever symptoms and sweating can lead to fluid loss, increasing the risk of dehydration.

  • Increased Heart Rate: If you have a high fever or are feeling weak, sauna use can place extra strain on your heart.

  • Worsening Symptoms: High heat may exacerbate symptoms like dizziness, fatigue, or nausea.

Spreading Illness: If your illness is contagious, using a public sauna could put others at risk.

When to Avoid a Sauna

You should avoid a sauna session if you experience:

  • High fever

  • Severe fatigue or dizziness

  • Vomiting or diarrhea

Any contagious illness (e.g., flu, COVID-19)

Best Practices for Sauna Use When Sick

If your symptoms are mild (nasal congestion, light sore throat, sneezing) and you don’t have a fever, here’s how to approach a sauna session safely:

1. Keep it short. Limit your session to 10–15 minutes. Your body is already working hard to fight the illness — you want a gentle nudge, not extra stress.

2. Lower the temperature. Drop 10–15°F below your usual setting. For infrared, aim for 110–120°F. For traditional, stay around 140–150°F.

3. Hydrate aggressively. Drink at least one full glass of water before your session and another immediately after. When you’re sick, you’re already more prone to dehydration from congestion, mouth breathing, and immune activity.

4. Skip the session if anything gets worse. If you feel dizzy, nauseous, or more fatigued after 5 minutes in the sauna, get out. The sauna should bring relief, not strain.

5. Use your own sauna. If you’re contagious (even mildly), avoid public or shared saunas out of respect for others. This is another reason a home sauna is a practical advantage — you don’t have to weigh the social consideration.

6. Cool down slowly. Don’t jump into a cold shower immediately after. When you’re sick, your body’s thermoregulation is already under pressure. Let yourself cool naturally for 10–15 minutes, then take a lukewarm shower.

7. Rest after. A post-sauna nap or quiet rest period amplifies the recovery effect. Your body does its best repair work when it’s warm, hydrated, and still.

If you’re unsure which type of sauna is best for your body while recovering, it helps to understand how different heat styles affect you—see our breakdown of infrared vs traditional saunas.

Why Infrared Saunas May Be the Better Choice When You're Under the Weather

If you’re going to use a sauna while dealing with mild cold symptoms, an infrared sauna is generally the more forgiving option — for a few practical reasons.

Lower air temperature, same core warming. Infrared saunas operate at 110–140°F (43–60°C), compared to 150–195°F for traditional saunas. When your airways are already irritated from a cold, breathing superheated air can feel harsh and drying. Infrared heat warms your body directly through radiant energy, so the air you breathe stays more comfortable while your core temperature still rises effectively.

Gentler on your cardiovascular system. When you’re sick, your heart is already working harder than usual. The lower ambient temperature of an infrared sauna places less overall cardiovascular demand while still delivering the circulatory and sweating benefits.

More practical for home use. If you own a home infrared sauna, you can take a 10-minute session without leaving the house, exposing others, or pushing through the effort of getting to a gym. Infrared saunas also heat up in 10–15 minutes (compared to 30–45 for traditional), which matters when you’re low on energy and patience.

Consistency before and after illness matters more than any single session. The evidence on sauna use is strongest for regular, consistent practice over time — not single sessions during illness. Having a home sauna that’s easy to use daily is what builds the consistent practice that delivers results over time.

For more on how infrared saunas work and whether they’re right for your home, see Why an Infrared Sauna for Home Might Be Your Best Wellness Investment.

Conclusion

Using a sauna when sick can provide temporary relief for mild cold symptoms, but it’s essential to weigh the benefits and risks. If you have a fever, severe symptoms, or a contagious illness, it’s best to rest and avoid sauna use. Always listen to your body and consult with a healthcare professional if unsure.

FAQs

hould I use a sauna when I have a cold?

A sauna can help with mild cold symptoms like nasal congestion, sinus pressure, and a light sore throat. The warmth opens airways and supports your body’s natural immune response. Keep sessions short (10–15 minutes), lower the temperature, and hydrate well. Avoid the sauna if your cold is accompanied by a fever.

Can I use a sauna with the flu?

No. The flu typically involves fever, body aches, and systemic fatigue — all of which are worsened by heat exposure. Skip the sauna entirely until you’ve been fever-free for at least 24–48 hours and your energy is returning to normal.

Is it safe to sauna with COVID-19?

No. COVID-19 places significant strain on your cardiovascular and respiratory systems. Using a sauna during an active COVID infection increases the risk of overheating, dehydration, and cardiovascular complications. Wait until you’ve fully recovered before returning to sauna sessions. If you use a shared or public sauna, also consider that COVID remains contagious for several days after symptoms begin.

Is an infrared sauna better than a traditional sauna when sick?

For mild symptoms, yes — infrared saunas are generally more comfortable because they operate at lower air temperatures (110–140°F vs. 150–195°F). This means the air you breathe is less harsh on irritated airways, while your body still gets the core-warming benefit. Infrared saunas also heat up faster and are more practical for short, gentle sessions.

Can a sauna help prevent getting sick?

Regular sauna practice is associated with various wellness markers in longitudinal research — the Finnish cohort studies are the most cited. The mechanism is hormetic heat stress: repeated mild thermal challenge that the body adapts to over time. Whether this translates to fewer sick days is an individual question, not a proven outcome. What the research does support is that consistent sauna use as part of a broader wellness routine — alongside sleep, nutrition, and movement — is associated with positive health markers over time.

How long should I stay in a sauna when sick?

No more than 10–15 minutes. When your body is already fighting an illness, you want a gentle thermal nudge — not an intense session. Use a lower temperature than your normal setting and stop immediately if you feel worse rather than better.

Disclaimer

At Body Wellness Club, we’re committed to providing science-backed insights and clean wellness tools to support your journey toward better health. Our content is intended for informational and educational purposes only and is not a substitute for personalized medical advice, diagnosis, or treatment.

Please consult with a licensed healthcare provider before making any decisions related to your health, supplements, or treatment plans. If you are experiencing a medical condition or emergency, seek professional care immediately.

Body Wellness Club and its contributors are not liable for any outcomes resulting from the use—or misuse—of information on this site. While we aim to keep all content accurate and up to date, we cannot guarantee it is free of errors or omissions.

Your wellness is personal. Make choices that reflect what’s right for you.

  1. Can saunas help with weight loss? (2023, medicalnewstoday.com)

Thinking About a Home Sauna for Year-Round Wellness?

Having a sauna at home means you can use it when you’re feeling great — and take gentle sessions when you’re feeling under the weather, without leaving the house or exposing anyone else.

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