The number of red blood cells, below a certain level, can produce anemia. There are many treatments for anemia: 1. The cause of anemia should be clarified, the causative factors should be eliminated, and etiological treatment should be carried out. For example, in iron deficiency anemia, the cause of iron deficiency should be corrected, such as malnutrition and gastrointestinal bleeding. For megaloblastic anemia, folic acid and vitamin B12 should be supplemented, and for aplastic anemia, the cause should be eliminated, such as stopping the use of related drugs. For hemolytic anemia, it is also necessary to discontinue medication or treat the cause such as anti-infection. There are other secondary anemias that require treatment of the primary cause.2. Undergo medication. Iron deficiency anemia, for example, requires iron supplementation. For megaloblastic anemia, vitamin B12 and folic acid supplementation are needed. Aplastic anemia, which requires the application of glucocorticoids, androgens, and immunosuppressants. Hemolytic anemia, which can also be treated with glucocorticoids and immunosuppressants. For renal anemia, erythropoietin can be applied. 3. Blood transfusion. For severe anemia, blood transfusion therapy is required. 4.Bone marrow transplantation. Such as aplastic anemia, thalassemia, can bone marrow transplantation for anemia treatment.