Sweating is a physiological function of human body to excrete and regulate body temperature. However, few people sweat on their palms, and most of them sweat on their backs, thighs and buttocks. Some people are a little different from others. They often don't sweat, but their palms are sweating all the time. Their symptoms are medically known as "hand hyperhidrosis", which is a kind of hyperhidrosis.

Studies have shown that palmar hyperhidrosis mostly occurs in young people aged 10-30, regardless of sex, and there is a genetic probability of 13%. Medically, palmar hyperhidrosis is caused by excessive excitement of sympathetic nerves, such as nervousness, excitement, mental stress or high temperature in summer, which can lead to a lot of abnormal sweating in hands.