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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.
With some types of anemia, you may have low numbers of all three types of blood cells. Anemia has three main causes: blood loss, lack of red blood cell production, or high rates of red blood cell destruction.