Iron deficiency anemia (IDA) is a common anemia caused by the lack of iron in the body, which affects the synthesis of hemoglobin. Before the production of red blood cells is restricted, the body's iron storage has been exhausted, which is called iron deficiency. This anemia is characterized by a lack of stainable iron in the bone marrow, liver, spleen and other tissues, and a decrease in serum iron concentration and serum transferrin saturation. The typical case of anemia is microcytic hypochromic type. This disease is a common type of anemia and is prevalent throughout the world. The causes of iron deficiency anemia: first, the increase in iron requirements and insufficient intake, second, poor iron absorption, and third, excessive blood loss, all of which affect the survival of hemoglobin and red blood cells and cause anemia.