Diarrhea does not need to be induced before a gastroscopy, but it requires an empty stomach and no medication. While diarrhea usually starts about half an hour to an hour after taking laxatives before colonoscopy. However, the exact time varies from person to person. For people with constipation and slow bowel movements, it may take 2 to 3 hours after drinking the laxative before they start to have a bowel movement. Enteroscopy is an examination method in which the enteroscope is inserted into the ileocecal region through the anus via the rectum to observe colonic lesions from the mucosal side. It is mainly used for the examination of colorectal polyps, ulcerative colitis, colon cancer and other diseases. After the colonoscopy, it is important to avoid strenuous exercise and barium enema examination for three days. It is recommended to start with a liquid diet after the operation, then transition to a semi-liquid diet after three days, and finally to a normal diet. If persistent abdominal pain, blood in the stool and other uncomfortable symptoms occur after the examination, it is recommended to go to the hospital in time, under the guidance of the doctor for treatment.