Colonoscopy is performed by removing fecal and other substances from the intestinal tract to observe the situation in the colon and rectal cavity, and generally requires abstinence from food for 3-7 days after the colonoscopy. Colonoscopy is performed by extending a thin tube with a mirror into the colorectal cavity to observe the situation in the colorectal cavity. When polyps or masses are found in the colorectal cavity, polypectomy or biopsy of the mass tissue can be performed directly under the colonoscope. If no abnormality is seen after colonoscopy, it is usually necessary to avoid eating for about 3 days because colonoscopy is an invasive operation and can cause some damage to the intestinal mucosa. If invasive operations are performed under colonoscopy, such as removal of polyps, the patient’s intestinal recovery time usually takes about 7 days. After the colonoscopy, you should rest for 2 hours before leaving the hospital, and then you can eat a liquid or semi-liquid food after exhaustion. Do not eat hard or spicy food to avoid intestinal bleeding or inflammatory reactions.