Colonoscopy is the most commonly used endoscopic examination to diagnose polyps, and polyps are usually not missed during colonoscopy. However, polyps can sometimes be missed if the patient’s bowel is not adequately prepared, the fecal matter is large, or there is gastrointestinal bleeding that causes unclear visualization under the microscope. Polyps that cannot be palpated by fingerprinting in the lower and middle rectum can be confirmed by colonoscopy. Colonoscopy, proctoscopy and small enteroscopy are the main methods to diagnose intestinal polyps, which can visualize the size, number, location and morphology of the polyps, and for the part that needs pathological diagnosis, pathological examination can be carried out by clamping the lesion tissues for a clear diagnosis. With the progress of colonoscopy technology, intestinal polyps can be treated under colonoscopy. If there are unexplained changes in bowel habits, blood in the stool or abdominal pain and bloating and other symptoms similar to intestinal polyps, it is recommended to do rectal fingerprinting or colonoscopy in a timely manner to clarify the condition and then targeted treatment.