There are many reasons for thinness. In addition to life factors such as malnutrition and excessive labor consumption, some potential physical diseases can also lead to weight loss. 1. hyperthyroidism: This is an endocrine disease. Due to the increase of metabolism, the body has an overeating appetite, but too many nutrients are decomposed in the body, which greatly consumes fat and protein in the body, resulting in weight loss, sometimes as high as 65,438+00 kg in a short time. If there is no obvious other reason leading to emaciation in clinic, this disease is most likely. Symptoms include overeating and emaciation, as well as rapid heartbeat, hyperhidrosis, goiter in the neck, hand tremor and emotional excitement. A few patients have no goiter or only mild goiter, and have no emotional symptoms of hyperthyroidism, but they can be diagnosed by laboratory examination. 2. Diabetes: manifested as "three excesses", that is, polyuria, polydipsia and polyphagia. A large amount of sugar is excreted from urine, and the catabolism of fat and protein increases, resulting in excessive consumption and gradual weight loss. About 40.6 ~ 56.6% of them are emaciated due to diabetes, and of course many patients are obese. There are also tuberculosis, malignant tumors, hematological diseases, gastrointestinal diseases, etc., which will all lead to emaciation.