Bleeding from the gastrointestinal tract may also be slow and insidious. Patients may have no symptoms, or symptoms of anemia. Changes in stool color indicating blood loss may be intermittent or not seen at all. Sometimes, chemical tests of the stool indicate a slow and subtle loss of blood. All instances of blood loss from the GI tract do warrant appropriate investigation. Most commonly, the upper intestines or colon are investigated with endoscopes, to ascertain the cause of bleeding. Occult traces of blood in the stool may be a sign of colon polyps or colon cancer.
At times, patients may have recurrent gastrointestinal bleeding not diagnosed with standard endoscopic procedures. The Cleveland Clinic Section of Endoscopy employs specialized techniques such as enteroscopy with dedicated, long enteroscopes, and a new video capsule swallowed by the patient, which provides vivid pictures of the entire gastrointestinal tract. These special devices can provide an accurate diagnosis without exposing the patient to the risks of surgery
Via: http://cms.clevelandclinic.org/
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