Sauna Health Benefits: Are saunas healthy or harmful?

A saunas' dry heat (which can get as high as 185° F) has profound effects on the body. Skin temperature soars to about 104° F within minutes. The average person will pour out a pint of sweat during a short stint in a sauna. The pulse rate jumps by 30% or more, allowing the heart to nearly double the amount of blood it pumps each minute. Most of the extra blood flow is directed to the skin; in fact, the circulation actually shunts blood away from the internal organs. Blood pressure is unpredictable, rising in some people but falling in others.
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