Body bursting thinness is not necessarily early stage or advanced cancer, and the cause needs to be identified. The reason for the rapid loss of weight may be diabetes or hyperthyroidism or tuberculosis. Diabetes mellitus has the typical symptoms of “three more and one less”, including drinking more, eating more, urinating more, and losing weight gradually. The blood glucose may be significantly higher, with fasting blood glucose greater than 7 mmol/L and postprandial blood glucose greater than 11 mmol/L, and the diagnosis of diabetes can be made for more than two consecutive times. The loss of weight may also be a combination of hyperthyroidism. Patients with hyperthyroidism may be diagnosed with hyperthyroidism when they have fever, easy sweating, rapid heartbeat, enlarged thyroid gland, and markedly elevated T3 and T4, in addition to weight loss. Tuberculosis is a wasting disease that can also cause gradual loss of weight. Of course, cancer can also cause gradual loss of body weight, but it is impossible to determine whether it is early or late stage from gradual loss of body weight. This is because the judgment of early or late stage of cancer is mainly determined by the size of the tumor, the presence or absence of metastasis in lymph nodes or distant organs.