What Is Hemophilia B?

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Hemophilia B is the second most common type of hemophilia. Like hemophilia A, it is mainly an inherited disorder but in cases can be acquired. People born with hemophilia B (almost always males and rarely in females) have little to no factor IX, a protein that helps your blood clot. When the blood can’t clot properly, it leads to prolonged bleeding and other signs and symptoms of hemophilia B.

There are different degrees of hemophilia B — mild, moderate, and severe — the treatment will depend on the severity. Small cuts or surface bruises are usually not a problem in people with hemophilia B and can be routinely treated with first aid, but more traumatic injuries can result in serious problems and potential disability. Treatments are available for those with more severe bleeding problems; usually, these involve replacing the deficient or missing clotting factor IX.

There is no cure yet for hemophilia B, but with the proper self-care and treatment, children and adults who have the disease can lead normal active lives.


Last Updated: 6/15/2009 2:19 PM
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