If there is a sudden enlargement of the abdomen in the recent past and the possibility of pregnancy is ruled out, it is generally considered to be caused by disease factors, and it is recommended to consult a doctor for examination in a timely manner. Doctors will first determine the abdominal contents. If the enlargement is caused by gas, it may be due to indigestion and other causes of abdominal distension. If it is liquid, you need to be alert to the presence of cirrhosis and other diseases that may lead to the accumulation of fluid in the abdominal cavity. If it is solid, it is suspected that it may be the small abdomen occupying lesions, such as abdominal tumors.1, abdominal distension: small abdominal distension is often caused by dyspepsia, which may be caused by gastrointestinal motility disorders. Clinical manifestations often include abdominal distension, constipation, and increased exhaust, which can cause sudden enlargement of the abdomen. It is usually treated by taking gastric stimulants such as domperidone and mosapride. In daily life, we should also pay attention to moderate eating light, easy to digest food, such as noodles, porridge, etc.; 2, abdominal fluid: clinical often caused by cirrhosis, also known as ascites, is the most significant clinical manifestation during the period of hepatic decompensation. When there is a large amount of ascites, the abdomen can appear bulging like pregnancy, the abdominal wall is taut and shiny, and the patient has difficulty moving. The treatment of ascites mainly applies diuretics, such as spironolactone, furosemide, etc. Regular transfusion of plasma, fresh blood or albumin to improve plasma colloid osmolality is not only conducive to the subsidence of ascites, but also helpful to improve liver function; 3. Abdominal tumor: If the area of the abdomen is enlarged, there is a solid feeling of hard lumps and lumps when touched, which may be caused by the appearance of tumors in the abdomen. It is recommended to consult a doctor in time to determine the benign and malignant nature of the tumor. Benign tumors mainly include fibroma, hemangioma, etc. Malignant tumors mainly include colorectal cancer, gastric cancer, etc. Surgical resection is often performed in the clinic. Surgical resection is often carried out in clinical practice, and radiotherapy or chemotherapy may also be carried out in the later stage according to the condition of the tumor.