There are various causes of excessive sweating, which may be physiological or related to autonomic function changes, and some patients are also related to genetic factors or caused by diseases such as infections, tumors, hyperthyroidism and other diseases. 1. Physiological factors: increased sympathetic excitability caused by mental tension, strenuous exercise, emotional excitement and other factors will increase secretion of sweat glands, resulting in excessive sweating. 2. Autonomic dysfunction: For example, during perimenopause, abnormal hormone secretion leads to autonomic dysfunction and vasodilatation dysfunction, resulting in excessive sweating. 3. Genetic factors: primary hyperhidrosis has family heredity, and people with a family history of primary hyperhidrosis are more likely to develop the disease. 4. Disease factors: infections, malignant tumors, hyperthyroidism, pituitary gland dysfunction, febrile illnesses, diabetes mellitus and hypoglycemia, etc., can cause autonomic nervous system abnormalities or endocrine dysfunction, which can also lead to increased sweating. In addition to the above, there are other conditions that may lead to increased sweating, if we can exclude physiological factors, it is recommended to go to the hospital for examination, and follow the doctor’s instructions for timely and targeted treatment, so as not to delay the course of the disease.