Weight is generally a measure of physical health indicators, if there is no weight loss or fat loss and other special circumstances, weight loss, the reasons are as follows: 1, endocrine system diseases: such as hyperthyroidism, hyperthyroidism patients are prone to weight loss and emaciation, and this is sometimes accompanied by sweaty palms, irritability, eating more, as well as easy to sweat and so on; 2, diabetes mellitus: its typical symptom is that the three more than one less. The typical symptoms of diabetes are three more and one less, large meals, drinking more water, more urine, and one less is weight loss; 3, malignant tumors: generally malignant tumors are a kind of consumptive disease, due to the large proliferation of tumor cells, which also consume the body’s nutrients, and patients with malignant tumors will also suffer from weight loss. If the patient has weight loss, it is recommended to go to the hospital as soon as possible to find a doctor for help, in order to find out whether there is hyperthyroidism, diabetes, and malignant tumors may be in the exclusion of these factors, but also to continue to observe their own weight.