Tidal sweating refers to the secretion of sweat by the sweat glands. There are two types of sweating, one is normal sweating and the other is abnormal sweating. The abnormal sweating may be a result of the body’s defensive Qi not being consolidated, leading to Yang deficiency and Qi deficiency. The diagnosis must be confirmed by examination. The medical history should include detailed questions about the causes of abnormal sweating before it occurs. For example, whether there is mental tension, emotional excitement, whether there is neurotrauma, history of medication and illness. For example, hemophilia can cause hematochezia, and chlorophenanthrene can cause redness of sweat. Ask if there are similar patients in your family to rule out genetic factors. Physical examination should focus on whether there are skin signs that induce abnormal sweating. If the patient is found to have ichthyosis, it is the cause of localized anhidrosis. The patchy damage of tuberculous leprosy, in addition to local sensory abnormalities, often has localized anhidrosis. Chronic radiation dermatitis damage, in addition to dry skin, atrophy, capillary dilation, often have localized anhidrosis. Therefore, a detailed physical examination can identify the cause of sweating abnormalities for a clear diagnosis. Prevention of tidal sweating: 1, to develop good habits, do not smoke. 2, maintain a good state of mind, stable emotions, have a healthy diet, usually eat more fruits and vegetables, etc., to improve self-immunity. 3, people who must work at heavy fumes, try to protect themselves, such as wearing a mask, go out regularly to get some fresh air, at least once a year to do a check-up, etc.