Sauna

Sauna is a type of hormetic thermotherapy. Exposure to high heat generates heat shock proteins, which induce mitochondrial biogenesis and have been linked to the regeneration of synapses.

Theory
It is not known through what mechanisms sauna may generate health benefits. It also induces the creation of endorphins, which may reduce pain, and improves circulation.

Evidence
Sauna was found to be beneficial for antihistamine-resistant urticaria, an autoimmune disease.

A 2015 study found that frequent sauna usage lowered men's risk of fatal cardiovascular disease and premature death from other causes. The study's conclusion reports, "Increased frequency of sauna bathing is associated with a reduced risk of SCD, CHD, CVD, and all-cause mortality. Further studies are warranted to establish the potential mechanism that links sauna bathing and cardiovascular health."

ME/CFS
A case study of two patients with chronic fatigue syndrome (CFS) found dramatic improvement in self-reported fatigue, pain, sleep disturbance, and low-grade fever after daily use for 35 days.

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 * 2016, 18 Incredible Science-Based Benefits of Regular Sauna Use