Patients with iron deficiency anemia as a result of chronic gastrointestinal blood loss should undergo tests (such as colonoscopy) to determine the cause of the chronic blood loss. Rarely, bleeding can occur from a diverticulum when a blood vessel inside the diverticulum is weakened by the infection and ruptures. Tears in the lining of your anus are called anal fissures. People who smoke or have high cholesterol are at increased risk.
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(polypectomy) can also cause later rectal bleeding days to weeks after the procedure. She was promoted to assistant editor shortly after. This site contains links to other sites.