Hemophilia

A group of hereditary genetic coagulation disorders that includes Hemophilia A, Hemophilia B, and Hemophilia C. Hemophilia A and B are X-linked disorders while Hemophilia C is an autosomal disorder. Hemophilia A is the most common form of the disorder and is characterized by Factor VIII deficiency. Hemophilia B is less common and is characterized by Factor IX deficiency. Hemophilia C is a lack of Factor XI. Symptoms may vary in severity but usually consist of internal and/or external bleeding (e.g. large joint bleeds).