Anemia is a condition in which the total volume of red blood cells in the circulating blood is reduced below the normal value. Iron deficiency anemia belongs to a category of anemia caused by a lack of hematopoietic raw materials. It occurs when the body's stored iron is depleted and cannot meet the needs for normal red blood cell production. Iron deficiency anemia is a common disease among red blood cell disorders and is categorized under anemias caused by a deficiency in hematopoietic raw materials.