Is Sauna Safe During Pregnancy?

The short answer: skip the sauna while you're pregnant

Saunas are best avoided during pregnancy. The concern is the same one that applies to hot tubs and very hot baths: anything that raises your core body temperature for an extended stretch can pose a risk to your developing baby. A traditional dry sauna, an infrared sauna, or a steam room can all push your temperature higher than is comfortable or safe, so the cautious and recommended choice is to wait until after pregnancy.

Why overheating is the real issue

The mechanism is straightforward. When you sit in a hot, enclosed space, your body absorbs heat faster than it can shed it, and your core temperature climbs. Sustained elevated maternal temperature, especially well above your normal baseline, has been linked to a higher risk of certain birth defects and is generally considered unsafe in pregnancy. Your body is already working harder to cool itself when you're pregnant, and a sauna overwhelms that system quickly.

On top of the heat itself, saunas can drop your blood pressure and dilate your blood vessels, which may leave you lightheaded, dizzy, or faint. A fainting episode carries its own risk of falls and injury, and dehydration from heavy sweating only adds to that. Put together, these effects make the sauna an environment worth steering clear of for the whole pregnancy.

Does the trimester change anything?

The heat concern is strongest in the first trimester, when your baby's major organs and neural tube are forming and are most sensitive to elevated temperature. That said, the advice to avoid saunas applies across all three trimesters. Later in pregnancy the overheating risk to organ development fades, but the dehydration, low blood pressure, dizziness, and fainting risks remain very real, so there is no point in the pregnancy where a sauna becomes a good idea.

What to do if you already had a sauna session

If you used a sauna before you knew you were pregnant, or had one short session and felt fine, try not to panic. A single brief exposure is not a guarantee of harm, and many people in this situation go on to have healthy pregnancies. Get out of the heat, cool down, drink water, and rest. Going forward, simply make the sauna off-limits and mention the exposure to your provider at your next visit so they can reassure you and answer any questions.

Safer ways to relax and unwind

You can still take excellent care of yourself without the heat. A warm (not hot) bath, a lukewarm shower, gentle prenatal yoga, a prenatal massage, swimming in a comfortably cool pool, and simple rest all offer real relaxation without raising your core temperature. If you're seeking relief from aches, a warm compress on a specific spot, good hydration, and supported rest tend to do far more good than a full-body heat session.

When to call your provider

Reach out to your provider if you became overheated and now feel persistently dizzy, faint, nauseated, or notice a racing heartbeat that doesn't settle once you cool down. You should also call promptly for any cramping, vaginal bleeding, fluid leakage, or a noticeable change in your baby's movements after a heat exposure. When in doubt, it is always reasonable to call and ask; your care team would rather hear from you than have you worry alone.

A note on breastfeeding

Sauna use is a topic many people revisit once the baby has arrived and they are breastfeeding, which is a separate situation with its own considerations, but it does not change the clear guidance to avoid saunas while you are still pregnant.

Bottom line

Avoid saunas throughout pregnancy; the overheating risk is real, and there are plenty of safer ways to rest and relax instead.