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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.
1 If the red blood cells size are normal in size (but low in number), this is called normocytic anemia, such as anemia that accompanies chronic disease or anemia related to kidney disease. 2  If red blood cells are larger than normal, then it is called macrocytic anemia. In general, there are three major types of anemia, classified according to the size of the red blood cells: 2  If the red blood cells are smaller than normal, this is called microcytic anemia. 3  The major causes of this type are iron deficiency (low level iron) anemia and thalassemia (inherited disorders of hemoglobin).