kokobko,
This could be due to be hemorrhoids, anal fissures, polyps, Crohn's Disease, peptic ulcer disease, and diverticulitis. Generally, the closer the bleeding site is to the anus, the blood will be a brighter red. Thus, bleeding from the anus, rectum, and the sigmoid colon tend to be bright red, whereas bleeding from the transverse colon and the right colon (transverse and right colon are several feet away from the anus) tend to be dark red or maroon colored. Stomach ulcers caused by ibuprofen, naproxen, or aspirin are common causes of upper GI bleeding. It could simply just be hemorrhoids, but I would have it checked out by your doctor.
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