The whole process of doing painless colonoscopy will be no pain at all. It is recommended to go to a regular hospital for painless colonoscopy to avoid adverse consequences. Painless colonoscopy is mainly through the propofol and other anesthetics to let the patient under anesthesia, intestinal examination. Patients are in an unconscious state during the examination and will not feel pain and discomfort. Painless colonoscopy can reduce the patient’s pain and help to relieve the patient’s anxiety and panic etc. Painless colonoscopy can mainly be used to diagnose inflammatory bowel disease, intestinal tumors, bleeding, ulcers, polyps, etc. Before painless colonoscopy, patients should follow the doctor’s instructions for fasting, water fasting, and taking laxatives such as mannitol to clean the intestines.