Chinese medicine believes that when taking a steam bath, people are in the transpiration of hot and humid air, and everything is nursed back to health, which can promote blood circulation, dredge collaterals and calm the nerves. Investigation shows that after sauna, 20% people feel comfortable and relaxed, and their skin is smooth and delicate. Sauna is very good, but not everyone can do it. The sauna room is not well ventilated, and the carbon dioxide exhaled by the bather cannot be discharged outside, which accumulates in the bathroom and increases the concentration of carbon dioxide in the bathroom. The concentration of carbon dioxide in sauna room is 2 to 5 times higher than that in general room and 2 times higher than that in audience hall of theater. Although most people will not be seriously injured in such a high carbon dioxide environment for a short time, some people will have temporary discomfort, such as headache, nausea and palpitation after bathing. Most people's blood vessels dilate and their hearts beat faster after taking a sauna. For women's skin, sauna is also a big harm. A lot of steaming will make the skin dehydrate quickly in a short time, and it will easily become dry and rough, which will cause chloasma on female skin. Therefore, only women with neutral skin are suitable for sauna, while women with oily and dry skin are not suitable for sauna. Oily skin is vigorous, and high temperature will make the expanded pores bigger and bigger, and the skin will be more prone to oil; For women with dry skin, the skin itself lacks moisture, and then a lot of water loss leads to drier skin, which will induce itching in winter. Saunas are also bad for men of childbearing age. Male sperm is stored in testis, and scrotum can be said to be the temperature regulator of testis. Sperm can be produced smoothly when the ambient temperature is 65438 0℃ to 2℃ lower than the body temperature. Too low temperature will affect sperm development, and too high temperature will lead to sperm death. Men who haven't given birth to children need to pay special attention not to go into the misunderstanding of health care for the temporary comfort of sauna.