Painless colonoscopy is generally beneficial to the examiner and there is no need to worry too much or regret it. Painless colonoscopy is a minimally invasive examination that is performed after the subject is put to sleep by injection of anesthesia. The colonoscope first enters through the anus and reaches the rectum, the sigmoid colon, the descending colon, the transverse colon, the ascending colon, the cecum, and the ileocecum, etc., and it can observe the mucous membranes of the intestinal luminaire and the state of the luminaire. Colonoscopy can find intestinal inflammation, intestinal polyps, intestinal obstruction and intestinal tumors and other lesions, so even if there is no lesion after painless gastroscopy can be used as a means of screening, there will be discomfort after painless colonoscopy, but usually lasts for about 6 to 8 hours can be gradually relieved, the human body is generally harmless, there is no need to be overly concerned, and no need to regret.