Iron deficiency anemia in the elderly should be treated in different ways according to different causes, for example, tumors can be treated by surgery, excessive blood loss should be corrected actively, and iron supplements should be taken for insufficient iron intake. 1. Tumor: Tumor can cause iron deficiency anemia, which should be treated with surgery, radiotherapy or targeted drug therapy according to the type and stage of tumor and the physical condition of the elderly. The drugs include carboplatin, pemetrexed and so on. 2. Excessive blood loss: peptic ulcer, esophageal varices and other diseases may cause long-term chronic blood loss, resulting in iron-deficiency anemia, at this time, the cause should be actively corrected, and the anemia symptoms can be gradually relieved after the chronic bleeding is cured. Drugs include omeprazole, etc. 3. Insufficient iron intake: If the iron intake in food is insufficient or poorly absorbed, it can also lead to iron deficiency anemia, at this time, we should pay attention to consume more iron-containing foods, such as red meat, spinach and other foods, and can also be supplemented with iron supplements under the guidance of the doctor. Iron deficiency anemia in the elderly may also be caused by other reasons, once the occurrence of iron deficiency anemia should go to the regular hospital in a timely manner to identify the causes and targeted treatment.