Bleeding after pooping is more common, and it varies with the color of the stool. It may be hemorrhoids, anal fissure, colorectal tumors, ulcerative colitis and so on. 1. Hemorrhoids: mostly internal hemorrhoids, mixed hemorrhoids, dry and hard stool during defecation may damage the surface mucosa of the hemorrhoidal nucleus, resulting in bleeding after stool pulling. Mostly bright red blood. 2. Anal fissure: the bleeding is bright red blood stool, usually accompanied by pain during defecation, the anus can be itchy, and in severe cases, the surface of the anus will be ulcerated. 3. Colorectal tumors or polyps: Bright red or dark red blood stools, often with mucus on the surface, and the amount of bleeding is often small. 4. Ulcerative colitis: manifested as mucus, pus and blood stools, often accompanied by diarrhea during defecation. If bleeding occurs after defecation, it is recommended to go to the hospital, ask the doctor to clarify the cause of the disease, and treat it accordingly.