Hemophilia is an inherited bleeding disorder. The blood of someone with hemophilia will not clot normally. Bleeding may occur spontaneously or following injury.
Hemophiliaoccurs in 2 forms, hemophilia A and B. In both forms, a gene is defective. The defective gene interferes with the ability of the body to produce the clotting factors that allow for normal clotting. The result is a tendency for abnormal, excessive bleeding.
Troy S Cutler, MD