Hemophilia is a disorder where the blood does not clot properly. This is due to the body not having enough blood-clotting proteins. This can lead to spontaneous bleeding as well as bleeding following injuries or surgery. They are two types of hemophilia. Hemophilia A and Hemophilia B. Hemophilia A is caused by the lack of low level or clotting factor VIII. Hemophilia B is caused by the lack or low level of clotting factor IX.