A regular colonoscopy can be uncomfortable. Painless colonoscopy can minimize the pain of a colonoscopy as much as possible. A colonoscopy involves extending the bowel of the colonoscope into the intestines to be able to visualize the lesions in the intestines. Since the smooth muscle tissue of the intestines is sensitive to stretching stimuli, it is possible to irritate the intestinal wall during colonoscopy, resulting in abdominal pain and other uncomfortable symptoms. The steps of colonoscopy are tedious, in order to prevent abnormalities during the examination, general anesthesia can be administered to the patient before the colonoscopy, which can reduce the pain of colonoscopy as much as possible. Colonoscopy is a widely used endoscopic examination method, through the colonoscopy can be found in colitis, intestinal tumors and intestinal polyps and other abnormalities, in the end of the examination needs to be appropriate bed rest, the examination of the discomfort symptoms will slowly ease.