What is the situation with blood on paper after defecation

There are two cases of bleeding after defecation, one is due to frequent constipation, stool is relatively thick, easy to cause anal fissure bleeding after defecation, or hemorrhoids rupture leading to bleeding. Another situation needs to consider whether there are rectal or colon polyps, bleeding due to surface ulcers, and whether there is ulcerative colitis, proctitis, etc. Routine examination and colonoscopy can be done. According to the results of the examination, it can be judged whether there are polyps or malignant lesions in the colon and rectum, and whether there are ulcers and ruptures in the mucous membranes.