Sudden profuse sweating may be physiological factors, or it may be caused by some diseases, such as hyperthyroidism, tuberculosis and so on. When the weather is too hot, sweating may occur after exercise or exposure to the sun, as well as some more obese people, will also be more prone to sweating, which are some of the more normal situations. In addition, some diseases may also cause sudden profuse sweating. 1. Hyperthyroidism: hyperthyroidism patient’s metabolism is abnormally vigorous, not only easy to sweat profusely, but also drink and eat more, but more thin. 2. Tuberculosis: Tuberculosis patients often sweat profusely and are gradually weakened. 3. Myocardial infarction: when in the state of heart attack, there will be profuse sweating, and accompanied by low blood pressure, agitation and other symptoms. If physiological reasons are excluded, sudden profuse sweating should be promptly consulted.