Gastroenteroscopy is necessary for the diagnosis of stomach and intestinal disorders. The decision to perform a gastroenteroscopy is made by the doctor after a comprehensive evaluation of the patient’s condition. Gastroenteroscopy is necessary when symptoms such as abdominal pain, bloating, diarrhea, constipation, or blood in the stool occur. If there are no symptoms, gastroenteroscopy is not necessary. Gastroenteroscopy is mainly divided into gastroscopy and colonoscopy. Gastroscopy is a procedure in which a flexible tube with a camera enters from the oral cavity, passes through the throat and esophagus, and enters the stomach and duodenum to examine the esophageal mucous membrane, gastric mucous membrane, and duodenal bulb, and to make a clear diagnosis of gastritis, esophagitis, and duodenal ulcers. Enteroscopy is mainly a hose with a camera, through the anus into the rectum, colon, sigmoid colon, ascending colon, descending colon, transverse colon, ileocecal part of the examination, can be clear rectal cancer, proctitis and other diseases diagnosis. At the same time, it is also able to take tissues for pathological biopsy in the process of examination, which is of great significance for the diagnosis of cancer.