What causes rectal bleeding during bowel movements?

Rectal bleeding during bowel movements may be caused by various factors, mainly including: 1. Hemorrhoids: Enlarged veins around the rectum and anus commonly cause bright red blood during defecation. 2. Anal fissures: Small tears in the skin or mucous membrane around the anus, often caused by straining during bowel movements, accompanied by pain and bleeding. 3. Intestinal infections or inflammatory bowel diseases: Conditions such as dysentery or ulcerative colitis can lead to rectal bleeding due to intestinal inflammation. 4. Rectal adenomas (rectal polyps): Friction against rectal polyps may cause bleeding during bowel movements. 5. Other factors: Colorectal tumors, gastrointestinal bleeding, blood disorders, or excessive use of antiplatelet or anticoagulant medications may also result in rectal bleeding. Given the wide range of possible causes for rectal bleeding during bowel movements, individuals experiencing this symptom should seek timely medical evaluation to determine the underlying cause and receive appropriate treatment.