Sweating is a normal heat dissipation response of the body and is controlled by the sympathetic nerves in the vegetative nervous system. When the ambient temperature or body temperature exceeds the body’s own temperature set point, the sympathetic nerves become active to prevent further increases in body temperature, and the body’s sweat glands secrete and evaporate to remove heat and cool the body. Sweating varies from person to person. At the same ambient temperature, some people sweat more and some people sweat less. However, when the ambient temperature is not high and sweating is not normally needed to dissipate heat, but still sweating profusely, it is called “hyperhidrosis”. Hyperhidrosis is divided into two categories: primary hyperhidrosis and secondary hyperhidrosis. Primary hyperhidrosis is a condition in which sweating increases significantly under normal conditions (ambient temperature and humidity, mental and emotional), and is not uncommon in clinical practice. The sweating is often aggravated by nervousness, hot food and spicy food, and increased ambient temperature and humidity. Hyperhidrosis is classified clinically as head sweating (often accompanied by excessive axillary and/or bilateral palmar sweating), hand sweating (often accompanied by excessive bilateral plantar and/or axillary sweating), axillary sweating, and body sweating according to the location of the sweating. Secondary hyperhidrosis is caused by neuroendocrine and other systemic diseases (e.g., hyperthyroidism, diabetes, hypoglycemia, toxicity, drug side effects, cardiovascular disease, respiratory failure, carcinoid syndrome, Hodgkin’s disease). Hyperhidrosis can be divided into generalized hyperhidrosis and localized hyperhidrosis according to the location of sweating. Generalized hyperhidrosis is mostly secondary hyperhidrosis, while localized hyperhidrosis is mostly primary hyperhidrosis.