Aplastic anemia currently still has an uncertain etiology. However, clinical observations have suggested that chemotherapy drugs, viral infections, and radiation exposure might be related to the occurrence and development of aplastic anemia. Regardless of the cause, these factors all involve abnormalities in immune function. Abnormal immune function leads to the occurrence and development of aplastic anemia. Therefore, immunosuppressive therapy is often effective for patients with aplastic anemia in clinical settings. (Medication use should be conducted under the guidance of a professional doctor.)