After the painless colonoscopy is completed, it usually takes about 4 to 6 hours to eat normally, and if treatment such as polypectomy is performed during the colonoscopy, it will take longer to resume normal eating. As each individual’s situation is different, it is recommended to choose the appropriate time to eat under the guidance of the doctor. Painless colonoscopy requires the use of intravenous anesthesia, and recovery from anesthesia takes 4 to 6 hours. Eating when the anesthesia is not fully metabolized is likely to produce vomiting and other uncomfortable symptoms. In serious cases, the anesthetic may enter the respiratory tract, causing respiratory distress and endangering life. In addition, during colonoscopy, it will cause irritation to the intestinal mucosa, and it will take some time to recover before eating, so as not to cause abdominal pain, abdominal distension and other uncomfortable symptoms.