What Are the Causes of Unexplained Bleeding?

Unexplained gastrointestinal bleeding (OGIB) refers to repetitive or persistent gastrointestinal bleeding that cannot be determined by routine digestive endoscopy (such as gastroscopy, colonoscopy) and X-ray barium, or small bowel CT examination 5% of canal bleeding. Recurrent iron deficiency anemia and fecal occult blood test were positive, or there were visible bleeding such as black stool, blood stool, or vomiting.