There are many reasons for the human body to lose weight, but if it is caused by pathological reasons, accompanied by the corresponding clinical manifestations, common causes of wasting include the following: 1, malnutrition: mostly seen in people who adhere to a vegetarian diet for a long time or excessive dieting, due to long-term protein, fat and other energy intake deficiencies that lead to wasting. 2, digestive system diseases: such as gastritis, enteritis, parasitic infections and other conditions, the body’s digestive and absorption disorders, affecting the absorption of nutrients leading to weight loss, generally accompanied by nausea, vomiting, diarrhea and other symptoms. 3, endocrine system diseases: such as hyperthyroidism, diabetes mellitus and other patients, due to the decomposition of the body’s nutrients appear pathological increase in consumption, resulting in gradual wasting of the body, mostly accompanied by palpitations, hand trembling, polydipsia, polyuria, polyphagia and other typical symptoms. 4, malignant diseases: such as tumors, blood system diseases, poor appetite when ill, and chemotherapy and other treatments will also lead to a decrease in appetite, resulting in insufficient intake of nutrients, resulting in abnormal wasting. Pathological wasting has certain causes, if necessary, it is recommended to consult a hospital promptly, according to the specific situation to improve the relevant examination, to clarify the cause and timely symptomatic treatment.