Sweating all the time while sleeping may be some kind of physiological phenomenon, or it may be a symptomatic manifestation of certain diseases, such as tuberculosis, hyperthyroidism, etc., which should be promptly consulted to identify the causes. 1. Physiological reasons: most common in infants and young children, due to high indoor temperature at night, too thick blanket or infants and young children with rich capillaries, metabolism, so sweat glands increase, there will be sleeping always sweating symptoms. 2. Pathologic causes. (1) Tuberculosis: due to the chronic infectious disease caused by Mycobacterium tuberculosis, the general population is susceptible to tuberculosis, patients with tuberculosis have low fever for a long time, especially in the late afternoon or evening, usually accompanied by sleeping sweat, loss of appetite, weight loss, etc., and in severe cases, there can be high fever, coughing, chest pain and other manifestations. (2) Hyperthyroidism: Hyperthyroidism is caused by excessive production of thyroid hormone by the thyroid gland itself, which accelerates the metabolic activity of the patient’s body, increases the excitability of the nervous, circulatory, and digestive systems and hypermetabolism, and therefore, the patient may have a fear of heat and sleep sweating, accompanied by tachycardia, fatigue, and weight loss, among other clinical manifestations. Patients with recurrent sleep sweating, excluding physiological factors, it is recommended to go to the hospital in a timely manner, by the doctor to clarify the cause of the disease, to give targeted treatment.