Infectious anemia is anemia caused by infectious diseases, commonly acute and chronic inflammation caused by various bacterial, viral or protozoan infections. The mechanism of anemia is blood loss, decreased erythropoiesis and increased destruction of red blood cells. After the diagnosis of infectious anemia, the treatment is divided into two parts: one is to get rid of the cause of the disease and treat the primary infection, and after the primary disease is cured, the anemia will naturally be gradually corrected. The second is the treatment of anemia. Mild anemia does not require treatment, while severe anemia can be treated with blood transfusion to reduce the symptoms of anemia. Erythropoietin is effective for infectious anemia, but the use of a larger dose, often need 10,000 units per day, after the use of serum iron can make further decline, should pay attention to iron supplementation. Iron application is ineffective for infectious anemia, and prolonged application of iron can increase iron stores and cause ferrous hemosiderosis.