Anemia occurs when the hemoglobin concentration of blood is reduced below normal levels. This condition may result from chronic blood loss, abnormal hemolysis, or nutritional deficiency. Many therapeutic agents can induce this change in hemoglobin as an unwanted side effect.

Different classifications of anemia are based in part on the pathophysiological factor inducing the decreased hemoglobin concentration. Anemias due to cell hy-poproliferation include aplastic anemia and iron deficiency anemia. Hemolytic anemia results from excessive destruction of red blood cells. Megaloblastic anemia, sideroblastic anemia, and iron deficiency anemia result from an abnormality in the maturation of red blood cells.

The Prevention and Treatment of Headaches

The Prevention and Treatment of Headaches

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