Rectal polyps can be detected by a number of tests, the simplest of which is a doctor’s fingerprinting. Diagnostic fingerprinting is the most valuable diagnostic method for experienced physicians, especially anorectal physicians, so almost all anorectal patients need to undergo a rectal fingerprinting, which can detect different conditions of rectal polyps with hyperplasia. An adjunctive test that has been used for a long time is to perform a barium enema, which can show a filling defect in the results. A filling defect is a polyp that occupies a portion of the area that the barium cannot fill, leaving a portion of the image missing, and the size of the missing image is indicative of the size of the polyp. The size of the missing image is an indication of the size of the polyp. However, there are limitations to the examination, and sometimes smaller polyps may not be detected, so it has gradually been replaced by the clearest and most intuitive colonoscopy. Both electronic and optical colonoscopy are now the best diagnostic and screening methods for detecting rectal polyps. Colonoscopy is relatively painless, and if it becomes widely available, the chances of detecting colorectal polyps and early colorectal cancer will be very high. It is important to have a colonoscopy before the age of 40 if you have bowel symptoms or a family history of the disease.