Acute hemorrhagic gastroenteritis is characterized by the sudden onset of bloody diarrhea and other gastrointestinal (GI) symptoms, like abdominal pain and nausea. In humans, acute hemorrhagic ...

Bright red blood usually comes from the lower colon or rectum, while dark red blood might mean bleeding higher up. Bloody diarrhea can be a symptom of anal fissures, hemorrhoids, or infections. Avoid ...

Possible causes of blood in stool include gastroenteritis, anal fissures, hemorrhoids, inflammatory bowel disease, and more. Treatment can depend on the underlying cause. Below, learn more about the ...