Hemophilia is a hereditary bleeding disorder caused by a deficiency of specific clotting factors, which prevents normal blood clotting. The two main types are hemophilia A caused by a factor VIII deficiency and hemophilia B caused by a factor IX deficiency. Symptoms include excessive bleeding, easy bruising, and bleeding into joints. It is usually passed from mother to son and is treated through replacement of the deficient clotting factor. Nursing care focuses on prevention of injury, control of bleeding episodes, and prevention of joint damage.