Hemophilia is a genetic bleeding disorder that results from decreased amounts of clotting factor in the blood. The amount of clotting factor determines whether the hemophilia is mild, moderate, or severe, with less factor characterizing a more severe case. Due to an impaired ability to clot, people with hemophilia may bleed for a longer time than others after an injury. They may also experience bleeding inside their body, especially in the knees, elbows and ankles. The hips and shoulders are also occasionally affected. This bleeding can damage organs, tissues, and joints, which may result in chronic pain, limited range of motion, and joint degradation. The main treatment for hemophilia is called replacement therapy, when the missing clotting factor is injected into the blood. Therapy on a regular basis is called preventative or prophylactic therapy. Administering therapy to stop bleeding only when it occurs is called demand therapy. Treatment type depends on the individual’s severity of disease, types of activities involved in, and any upcoming dental or invasive procedures.