Feeling under the weather can easily drain your energy, but the idea of sitting in a warm sauna can sound tempting. So, is it actually safe to use a sauna when you have a cold or flu? The short answer — sometimes. In this article, we’ll break down when sauna use can help, when it can make symptoms worse, and how to tell the difference.

Understanding the Difference Between a Cold and the Flu

Both colds and the flu come from viruses, but their severity differs:

  • Cold symptoms: runny or blocked nose, sneezing, sore throat, mild tiredness.

  • Flu symptoms: high fever, body aches, chills, headaches, and extreme fatigue.

Knowing which one you’re dealing with is key. A mild cold may allow for gentle sauna use. A fever or flu is usually a sign to stay out.

Can a Sauna Help When You’re Sick?

For mild cold symptoms, a sauna can offer some relief:

  • Clearer airways – Warm, dry air can help loosen mucus and open nasal passages, making it easier to breathe.

  • Relaxation and reduced tension – Heat helps relax muscles and can ease general discomfort.

  • Improved circulation – Research from the National Library of Medicine shows that sauna use can stimulate blood flow and support immune function.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5941775/

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The Risks You Need to Know

Saunas aren’t always a good idea when you’re sick. In some situations, they can make things worse:

  • Fever + sauna = bad idea – If your body temperature is already high, extra heat can put too much strain on your system.

  • Dehydration – Most people are already dehydrated when ill; sweating in a sauna increases this risk.

  • Heart strain for some people – Harvard Health advises avoiding saunas if you’re very unwell or have heart or blood pressure issues, especially during flu.
    https://www.health.harvard.edu/staying-healthy/saunas-and-your-health

If you’re experiencing flu symptoms, chest discomfort, dizziness or weakness, skip the sauna and focus on rest and hydration.

Guidelines for Sauna Use While Ill

We’re not health professionals, but we generally suggest the following:

  • No sauna if you have a fever.

  • Okay with a mild cold, as long as the session is short (10–15 minutes) and you feel well enough.

  • Drink plenty of water before and after.

  • Leave immediately if you feel light-headed, nauseous, or weaker than before.

  • Check with a GP if you have underlying health conditions or your illness is more serious than a mild cold.

Small Choices That Make a Big Difference

Saunas aren’t a cure, but they can offer comfort when used sensibly. The key is to listen to your body. Mild cold? A short session may help you breathe easier and relax. Flu or fever? Best to stay wrapped in a blanket, not in a sauna.

Curious about tech in the sauna? Want to know if it’s safe to bring your phone inside? We’ve covered that here:
https://prolinedirect.co.uk/can-you-bring-your-phone-in-a-sauna-what-you-need-to-know/

In Summary

Using a sauna when you have a cold or flu can be beneficial — but only under the right circumstances. Mild cold symptoms and no fever? A short session might help. Flu, fever, or dizziness? Skip it. When in doubt, speak to a healthcare professional.

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