Saunas are a great way to relax after a workout or just to unwind, but it is important to remember that they are not without risks. The main risks are dehydration, overheating, and exposure to dangerous chemicals (heated plastics create hazardous fumes). The best way to avoid these dangers is to stay in the sauna for only 20 minutes or less, to drink plenty of water before and after using the sauna, and to always wear loose-fitting cotton clothing. The best clothing for a sauna is swimwear, because it is both comfortable and breathable.
You should also take off any metal jewelry, such as rings or piercings, before entering the sauna because they can get hot in the heat and cause discomfort. It is also best to leave your cellphone and any other electronic device at home, since the high temperatures can damage them. Additionally, you should take off any sweaty gym clothes before going into the sauna, as they can be unpleasant to sit in for long periods of time.
Lastly, it is best to avoid putting on makeup or perfume at least 24 hours before entering the sauna, as these things enter your pores and defeat the purpose of the sauna by causing your body to produce more toxins. In addition, if you have any medical conditions, such as unstable angina or coronary heart disease, it is best to talk to your doctor before using a sauna.