The body is getting thinner and thinner, the items that need to be checked are as follows: First, blood sugar, when the body has elevated blood sugar, a large amount of glucose is discharged from the urine, the carbohydrates available to the body are reduced, and the body carries out lipolysis to supply energy, and there will be symptoms such as wasting, thirst, and polyuria. Second, need to check the thyroid function, the body is getting thin when the body is eating normally or even eating a large amount of food, should be ruled out hyperthyroidism. Hyperthyroidism is mainly characterized by hypermetabolic syndromes such as fear of heat, excessive sweating, excessive eating, easy to hunger, and thinness. Third, normal eating body but more and more thin, in the exclusion of hyperthyroidism and diabetes mellitus, but also should be further examination, in order to exclude the common parts of the malignant tumor consumption caused by wasting, such as liver, gastrointestinal tract, pancreas and other parts of the malignant tumor.