Iron deficiency anemia is one of the most common types of anemia clinically. The principle of treating iron deficiency anemia involves etiological treatment and symptomatic treatment. Etiological treatment means treating according to different causes, while symptomatic treatment involves correcting anemia and supplementing the raw materials for blood formation. The most common causes of iron deficiency anemia include gastrointestinal bleeding, internal hemorrhoids bleeding, hookworm and roundworm infections, malnutrition, and, notably in women, excessive menstrual bleeding and excessive bleeding during pregnancy and childbirth. These are common causes of iron deficiency anemia seen clinically. With the cause of iron deficiency anemia identified, the treatment often has a relatively high cure rate.