A thin person with a large belly is a colloquial term or an epiphenomenal description. In clinical people thin belly big, is wasting at the same time appear froggy abdomen, a lot of ascites, wasting at the same time appear a lot of ascites. Mainly common in the following three diseases: first, seen in the post-hepatitis cirrhosis decompensation, hypoproteinemia caused by ascites, need further supplementation of human albumin, while diuretic treatment. Second, seen in the gastrointestinal tract or various malignant tumors of the digestive tract, caused by hypoproteinemia, resulting in ascites, conditions permitting surgical radical resection treatment, and be supplemented with human albumin treatment. Third, seen in tuberculosis and other malnutrition diseases, along with a large amount of ascites, need to be diagnosed after anti-tuberculosis treatment, that is, isoniazid plus rifampin oral for at least a year.