The reasons for not sweating are considered to be caused by physiological factors, or pathologic factors, such as ichthyosis, diabetes mellitus, scleroderma, and so on. 1. Physiological factors. (1) Dehydration: when there is a lack of water in the body, it will lead to the condition of not sweating. It can be relieved by replenishing water, and you should make a habit of drinking more water in daily life. (2) Less exercise: less or no exercise in daily life, the body’s metabolism slows down, the sweat gland secretion is reduced, resulting in not sweating. 2. Pathological factors. (1) ichthyosis: patients who suffer from ichthyosis, the skin often flakes, will block the sweat glands, resulting in sweat can not be normally discharged, and then the symptoms of not sweating. (2) diabetes: diabetic patients will also show the symptoms of not sweating, usually due to diabetes caused by peripheral neuropathy of the sweat glands, can not be normal functional regulation. (3) Scleroderma: When patients with scleroderma are in the sclerosis stage, their skin becomes thicker and harder, which leads to the blockage of sweat glands and the symptoms of not sweating. If you don’t sweat, you should seek medical attention.