A type of endoscopy called colonoscopy looks at the large intestine. If blood is coming from the rectum or the lower colon, bright red blood will coat or mix with the stool. It uses a flexible instrument inserted through the mouth or rectum to view the inside of the GI tract. The signs of bleeding in the digestive tract depend upon the site and severity of bleeding. ![]() The test used most often to look for the cause of GI bleeding is called endoscopy. There are many possible causes of GI bleeding, including hemorrhoids, peptic ulcers, tears or inflammation in the esophagus, diverticulosis and diverticulitis, ulcerative colitis and Crohn's disease, colonic polyps, or cancer in the colon, stomach or esophagus. GI bleeding is not a disease, but a symptom of a disease.
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