Thinness in men may be caused by hyperthyroidism, diabetes and bad lifestyle habits. Patients can be treated with propylthiouracil and hypoglycemic drugs as prescribed by the doctor, and can also be relieved by quitting smoking and drinking. 1. Hyperthyroidism: If there is too much thyroid hormone in the body, it leads to the manifestation of high metabolic syndrome. As a result, patients usually show heat, sweating, tachycardia, weight loss and increased food intake. Because the metabolic rate is relatively high, the calories consumed are relatively high, and the man will have the symptom of wasting. Patients can follow the doctor’s instructions oral methimazole, propylthiouracil and other drugs to treat. 2. Diabetes: Due to the diabetic patients long-term blood sugar is too high, sugar utilization obstacles, causing fat, protein consumption, resulting in men thin. It is recommended that patients follow the doctor’s instructions to use hypoglycemic drugs to treat. 3. Bad life habits: long-term smoking will stimulate the central nervous system of the brain, resulting in decreased appetite, yellowish color and weight loss. A lot of alcohol abuse may cause gastritis, gastric ulcers and liver disease, which leads to rapid weight loss, patients should quit smoking and drinking in time to alleviate the symptoms of thinness. After excluding the physiological causes of thinness in men, if the above symptoms occur, you should go to the hospital in time to cooperate with the doctor’s treatment.