Iron deficiency anemia is treatable, but it is essential to identify the cause of the iron deficiency. The treatment of iron deficiency anemia is divided into two main parts. The first part involves iron supplementation, which can be administered orally or intravenously, with intravenous supplementation generally being more effective and faster. The second part is crucial: identifying the cause of the iron deficiency. For example, common causes in women of childbearing age include heavy menstrual periods, while older patients often suffer from gastrointestinal tumors or ulcers, and in children, the common cause is usually nutritional deficiency. It is vital to treat the underlying cause.