Houston Digestive Diseases Clinic 
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What if you were a plumber and couldn't find the leak? That  is the situation that sometimes frustrates doctors asked to.  evaluate a patient with signs of iron deficiency anemia due to blood loss. There are many types of anemia. Iron Defficiency Anemia is a common type and most often occurs in pregnant women or menstruating women due to the monthly loss of blood. But when significant iron deficiency anemia occurs in women after the age of menopause or in men, it is often a sign of the loss of blood from somewhere else - usually the digestive tract. This blood loss may be very gradual and not visible to the patient. But over time, the continued loss of blood can deplete the body of iron and anemia develops.
If a doctor suspects that anemia is due to intestinal bleeding, special tests are usually ordered to help the doctor "find the leak." This is a bigger task than most people realize since the average adult digestive tract is approximately 30 feet in length. The top 4 feet (Upper GI, or UGI TRACT) includes the esophagus (foodpipe) and stomach and first portion of the small intestine, called the duodenum. The bottom 6 feet makes up the COLON and rectum. In between, lies the rest of the 20 feet of SMALL INTESTINE where the process of digestion actually
occurs
 
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