Abdominal distension is a symptom induced by increased pressure in the abdominopelvic cavity, causing abdominal distension due to a variety of reasons, functional dyspepsia, pregnancy, ascites, abdominopelvic organ occupation, and other pathologic causes. 1. Functional dyspepsia: Functional dyspepsia is a relatively common cause of abdominal distension, poor digestion and absorption will lead to intestinal flora imbalance, so that the nutritional impact of the intestinal tract and the production of a large amount of gas, which will lead to abdominal distension. 2. Pregnancy: After pregnancy, women’s hormone levels will rise, which will inhibit the smooth muscle of the digestive tract, which will make the intake of food can not be properly digested and absorbed, it is easier to appear bloating, flatulence and other symptoms. And after pregnancy due to the uterus enlargement so that the gastrointestinal tract is compressed, will also appear this situation. However, they are normal phenomena, and usually disappear after delivery. 3. Ascites: If the patient has ascites and also feels bloated, accompanied by spontaneous peritonitis, there will usually be abdominal distension, fever and abdominal pain and other symptoms. 4. Occupation of abdominal and pelvic organs: if the patient suffers from tumor and occupation of pelvic organs, it will lead to the increase of pressure in the abdominal and pelvic cavity, which will also lead to abdominal distension. There are many other cases of abdominal distension, which need to go to the hospital in time to get a clear diagnosis and then carry out the treatment.