Many things: There are many causes of intestinal bleeding. Ulcers of the stomach or duodenum, bad gastritis, small intestinal disorders such as vascular malformation, crohn's disease, small bowel tumors, colon cancer, colon infections, ulcerative colitis, vascular lesions of the colon are some of the more common that i can think of. Also ulcers from medications, liver cirrhosis with enlarged esophageal veins.
Answered 1/16/2020
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