What factors can cause internal intestinal bleeding?

Many things. Depending on where the bleeding is coming from (ie the upper GI tract, or the lower GI tract) it can be an ulcer, polyp, cancer, inflammation, or sometime the source is never found. All GI bleeding should be worked up, and you need to speak to your doctor.

Related Questions

What causes intestinal bleeding?

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. Read more...