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There are more than 400 types of anemia. These types of anemia are divided into three main groups, according to their cause. There is anemia caused by blood loss, by decreased or faulty red blood cell production, and by destruction of red blood cells.
This type of anemia occurs as part of a chronic inflammatory disorder, most often chronic infection, autoimmune disease (especially RA), kidney disease, or cancer; however, the same process appears to begin acutely during virtually any infection or inflammation, including trauma or post-surgery. (See also Anemia of Renal Disease.)