A colonoscopy can be reassuring for about 3 months to 1 year if no abnormality is found. Regular follow-up colonoscopy is usually recommended so that specific changes in the intestinal tract can be observed, and the intestinal mucosa can also be analyzed for any pathological conditions. If you have intestinal polyps or enteritis, you can shorten the period to once every six months. When it is found that the polyps are growing gradually or the inflammatory cells are gradually increasing, you should cooperate with the doctor for comprehensive treatment. During colonoscopy, if abnormal reaction or ulcerated or congested intestinal mucosa is found, it is recommended to take pathological examination as soon as possible, which can clearly diagnose whether there is intestinal cancer or not. After having colonoscopy, regular observation should be made, and if there is abdominal pain, blood in stool, dry stool, etc. in the later stage, one should go to the hospital for rechecking regularly.