Rectal bleeding after bowel movement. what could this indicate?

Multiple causes: Anorectal disease, such as hemorrhoids, fistula, or fissure, and , of course, benign or malignant growths. You could also have bleeding from a small bowel abnormality called meckel's diverticulum. Other causes include diverticular disease or inflammatory bowel disease. If the blood is dark and not red, it could come from the upper GI tract, such as the stomach.Please seek an evaluation. Good luck.