A lack of factor VIII is hemophilia A, and a lack in factor IX is hemophilia B. They can cause excessive bleeding because the person is unable to clot.

In the most common type, Hemophilia A, the person lacks clotting factor VIII. In Hemophilia B, clotting factor IX is lacking.

Pretty much, alchemy is the best factor in achieving a special medicine

The main treatment for hemophilia is called replacement therapy. Concentrates of clotting factor VIII or clotting factor IX are slowly dripped or injected into a vein.

factor I (fibrinogen), factor II (prothrombin), factor III (tissue thromboplastin), factor IV (calcium), factor V (proaccelerin), factor VI (no longer considered active in hemostasis), factor VII (factor-vii), factor VIII (antihemophilicfactor), factor IX (plasma thromboplastincomponent; Christmas factor), factor X (stuart-factor-stuart-prower-factor), factor XI (plasma thromboplastinantecedent), factor XII (factor-xii), factor XIII (fibrin stabilizing factor).