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| | Hemophilia - Definition, Description, Demographics, Causes and symptoms, Diagnosis, Treatment, Prognosis, Prevention, ... |
 | | In hemophilia B, or Christmas disease, the deficient clotting factor is factor IX, but the symptoms are very similar to those of hemophilia A. Factor IX is produced in the liver and is dependent on interaction with vitamin K in order to function properly. |
 | | Hemophilia C is rare and much milder than hemophilia A or B. It involves reduced activity of factor XI and is characterized by mild bleeding such as nosebleeds (epistaxis) or prolonged menstrual bleeding, or mild bleeding after tonsillectomies or dental extractions. |
 | | Hemophilia B occurs in one in 40,000 to 50,000. |
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