The causes of sweating and wet hair can be divided into physiological and pathological causes. Physiological causes usually include spicy diet, hot weather, strenuous exercise, mental stress, etc.; pathological causes usually include various systemic diseases. 1. Physiological causes: eating spicy, hot food, stimulate the body to sweat, and the head and face sweat glands are rich, easy to show for head sweat, wet hair; strenuous exercise can make the basic metabolism speed up, body temperature rises, promote sweat secretion can also be shown in the head sweat, wet hair; mental tension to the sympathetic nerve excitation, can also cause head and face sweating, wet hair. 2. Pathological causes: The common pathological cause is primary hyperhidrosis. This disease is related to genetic factors, the pathogenesis is not clear, mostly manifested in the armpits, hands and feet, head and face and other parts of the unexplained sweating. There are also secondary hyperhidrosis, mostly secondary to certain diseases or related to the application of specific drugs. Among them, only the head is prone to sweating is mostly seen in gustatory sweating syndrome, which most often occurs after parotid gland surgery, caused by local nerve injury, manifested as transient sweating, flushing and abnormal sensation of the skin near the pre-temporal area of the same ear when eating. In addition, it may also be other systemic diseases, usually not only show excessive sweating on the head, but also systemic sweating, such as diabetes mellitus, hyperthyroidism, vitamin deficiencies, Parkinson’s disease, spinal cord injury, cerebrovascular disease, pheochromocytoma, insulinoma, carcinoid tumor, acromegaly, as well as drug toxicity, and so on. It is recommended that patients with frequent episodes of such symptoms should consult a doctor in time to clarify the cause of the disease, and then standardize the treatment under the guidance of the doctor in time to avoid delaying the condition.