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Causes of iron deficiency anemia include: 1  Blood loss. Blood contains iron within red blood cells. 2  A lack of iron in your diet. Your body regularly gets iron from the foods you eat. 3  An inability to absorb iron. Iron from food is absorbed into your bloodstream in your small intestine.  Pregnancy.
Blood loss is a common cause of iron-deficiency anemia. Anemia is a general term for a lack of healthy red blood cells in the body. Iron-deficiency anemia is the most common type of anemia and occurs due to inadequate amounts of iron in the body. Iron-deficiency anemia commonly develops as a result of blood loss.Crohn's disease, a chronic digestive condition characterized by inflammation of the gastrointestinal tract, often leads to blood loss.he inflammation associated with Crohn's disease often causes chronic diarrhea, pain and rectal bleeding. MayoClinic.com notes that blood loss is the most common cause of iron-deficiency anemia in the United States and Western Europe.