Plain CT shows that there is intestinal gas, if the intestinal gas is more serious or accompanied by other symptoms, it is necessary to do enhanced CT or other auxiliary examination to further confirm. In general, the presence of intestinal gas indicates the presence of certain abnormalities in the intestinal tract. If the condition of intestinal gas is more serious on plain CT, enhancement CT can be done to further confirm the condition. Enhanced CT can detect common diseases of the intestine, such as intestinal inflammation, intestinal malformation, intestinal perforation, intestinal tumor, intestinal ischemia and other diseases. The presence of intestinal gas can be caused by diseases such as incomplete intestinal obstruction, functional colonic disease or when constipation is present are prone to intestinal gas. In addition to the use of enhanced CT for further confirmation, the patient can also take a standing plain film of the abdomen or an electronic colonoscopy to further confirm the cause of the pneumoperitoneum. If the patient usually accompanied by some other physical symptoms, such as diarrhea, blood in the stool, black stool, abdominal pain and other symptoms, it is recommended that the patient as soon as possible to the hospital for further examination.