Rectal bleeding describes any visible blood on stool, toilet paper, or in the toilet after a bowel movement. It can occur as a single episode or as repeated episodes over time. This page explains common causes, signs that need faster assessment, and which specialties can help; it is for general information only and not a substitute for medical evaluation.
The color and where you see the blood can suggest its origin: bright red blood often comes from an area near the anus, while dark or blackened stool may point to bleeding higher in the digestive tract. Color alone does not give a definitive diagnosis; a clinician combines this with history and examination.
Many conditions can cause rectal bleeding. Frequent causes include hemorrhoids, anal fissures, inflammatory bowel diseases (Crohn’s disease, ulcerative colitis), colorectal polyps, diverticular disease, and certain infections. Less often but importantly, colorectal cancer can present with bleeding. Specialist assessment is required to identify the cause.
If bleeding is heavy or cannot be controlled, if you experience fainting, severe dizziness, very fast heartbeat, or a sudden drop in consciousness, seek emergency care. Ongoing bleeding with fever, significant abdominal pain, unexplained weight loss, or large changes in bowel habits also warrants prompt evaluation by a clinician.
Primary care (family medicine) is often the first point of contact; your clinician may refer you to gastroenterology or general surgery for further tests such as endoscopy or imaging. The evaluation typically includes medical history, physical exam, and targeted investigations to locate the source of bleeding.
Note when the bleeding started, how often it happens, the amount and color of blood, associated symptoms (pain, fever, bowel changes), and any existing medical conditions or medications. Bringing this information to your appointment helps clinicians plan appropriate investigations.
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