Nearly every site discussing the benefits of saunas repeats the claim that saunas help the body expel toxins. Because of this claim, people sit in a hot sauna when they are ill with a cold or feeling hungover, believing the heat will discharge toxic chemicals and make them feel better. This is not entirely true. The truth is, the liver processes toxins, and seldom needs extra help. Spending time in a sauna can make you dehydrated due to increased sweating, and dehydration can slow the work of the liver. People with colds or hangovers will do better with bed rest and lots of water than time in a sauna.
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