Intestinal gas interference is mainly due to chronic gastritis, gastrointestinal disorders, indigestion, as well as dietary factors, intestinal obstruction and other reasons, resulting in increased gas in the intestine or poor discharge, etc. The increased gas in the intestine will interfere with the diagnosis of auxiliary examinations, mainly seen in: 1, abdominal ultrasound, abdominal organs to do ultrasound examination when a large amount of gas in the intestine, resulting in the ultrasound probe issued by the ultrasound can not penetrate the abdominal tissues, organs and image, resulting in interference with the diagnosis of disease. 2, X-rays, CT and other radiological diagnosis of abdominal diseases, such as abdominal plain film and CT of liver, gallbladder and pancreas, etc., also due to the large amount of gas accumulation in the intestinal tract, resulting in the X-ray image of a large area of low-density shadow, affecting the diagnosis of the disease. In response to intestinal gas interference, the gas in the intestine can be expelled using methods such as anal canal venting and enema, and then further examination can be performed.