A colonoscopy done six months ago showing no abnormalities usually does not need to be reviewed. If, as a routine examination, the patient’s colonoscopy results six months ago showed no polyps, inflammation, ulcers and other abnormalities, it is generally recommended to do colonoscopy once every five years or so, and at the same time, it is necessary to pay attention to whether there is frequent abdominal distension without cause or trigger, abdominal pain, diarrhea, or change in the number and character of stools, and so on, and if it occurs, it is necessary to do another colonoscopy. After the colonoscopy should pay attention to the observation, if there is abdominal pain, dry stools, blood in the stool, etc., should go to the regular hospital in time to consult the doctor, after clarifying the cause of the disease, under the guidance of the doctor to carry out targeted treatment, in order to reduce the adverse effects of the disease.