Differential diagnosis of abdominal fluid is as follows: 1. Hepatogenic ascites, such as cirrhosis, hepatocellular carcinoma, liver failure, etc., with a history of liver disease and risk factors for liver disease, such as hepatitis, alcoholism, and other signs and symptoms of portal hypertension; 2. Cardiac ascites, congestive heart failure, constrictive pericarditis, restrictive cardiomyopathy, and mucus oedema, mostly with a history of heart disease, liver enlargement, and a positive sign of hepatic jugular reflux; 3. Nephrogenic ascites, nephrotic syndrome, uremia Ascites of biliary and pancreatic origin, increased amylase in ascites in severe pancreatitis; 5, infectious ascites, gastrointestinal perforation can be diagnosed by abdominal plain radiographs to find free gas in the abdominal cavity, tuberculosis ascites examination, Mycobacterium tuberculosis smears and cultures, and biopsy by laparoscopic examination can help to diagnose it, and bacterial peritonitis, which is mostly seen in patients with cirrhosis of the liver Ascites examination, multinucleated leukocytosis; 6, tumor ascites, abdominal metastatic tumors such as stomach, colon, pancreas, hepatocellular carcinoma, ovarian tumors, peritoneal mesothelioma, etc., the nature of ascites is mostly bloody, and the diagnosis can be confirmed by laparoscopy of ascites to look for tumor cells; 7, connective tissue disease, systemic lupus erythematosus is most common in women, multi-organ damage, which can be accompanied by pleural fluid, pericardial effusion, and pteroidal erythema on the face; 8, dystrophic edema, the appearance of nutritional disorders, generalized edema, and the presence of malnutrition. Nutritional disorders, generalized edema, and hypoproteinemia are present.