Hemophilia B

Hemophilia B is a rare bleeding disorder that causes symptoms like prolonged bleeding and easy bruising. It is also known as factor IX deficiency or Christmas disease. Hemophilia B is less common than hemophilia A, affecting about 3,300 Americans, or 15% of people with hemophilia. Like hemophilia A, hemophilia B is mainly an inherited disorder that results from a deficiency of a protein necessary to the blood-clotting process. However, in about 30% of cases there is no family history of hemophilia. Rather, the condition occurs later in life as the result of a spontaneous gene mutation.

Hemophilia B can present challenges for individuals with the condition. Treatments for hemophilia B largely depend on the severity of symptoms. The condition also largely requires self-care, preparedness and support from your healthcare team.

Education and understanding of hemophilia B can help make living with the disease easier. This section can help:

What Is Hemophilia B?
Symptoms
Causes
Severity
Diagnosing Hemophilia B
Hemophilia B Treatment Options
Complications
Common Questions