AA in medical terms is the acronym for aplastic anemia. Aplastic anemia is a bone marrow hematopoietic failure disorder in which patients are clinically characterized by a decrease in whole blood cells in the peripheral blood. According to the severity of the disease and the degree of progression, aplastic anemia is divided into two categories: chronic aplastic anemia and acute aplastic anemia. Generally, patients with chronic aplastic anemia have mild anemia, bleeding, infection and other symptoms, which usually do not require special treatment or symptomatic treatment, but need to take cyclosporine, Conilon and other drugs for treatment. Acute reoccurrence progresses rapidly, and patients will have obvious symptoms such as infection and anemia, and often need to be given red blood cell transfusions and platelet transfusions to control infection, as well as immune combination therapy, which generally requires the application of cyclosporine combined with anti-lymphocyte globulin therapy. For younger patients, the most effective method is still to do allogeneic bone marrow transplantation treatment.