Iron deficiency anemia, a common and frequently occurring disease in the department of hematology, is not difficult to diagnose and treat. The key to treatment lies in addressing the cause of the iron deficiency, and it is essential to eliminate the underlying causes as much as possible. Using iron supplements alone can only restore blood counts; neglecting the primary disease will not lead to a complete cure of the anemia and can easily lead to recurrence. Treatment consists of two phases: first, the supplementation with iron supplements. After taking iron supplements for three to four days, an increase in reticulocytes will occur, reaching a peak around seven days, and hemoglobin will significantly rise after two weeks of medication, returning to normal levels after one to two months. However, after hemoglobin levels normalize, some patients may stop taking the medication. It is important to note that continuing to take iron supplements for three months is necessary to replenish the body's iron stores completely.