What is hemophilia B?
Hemophilia B is an inherited bleeding disorder that only occurs in males. A male with hemophilia B is missing a protein called factor 9, which helps form blood clots. Normal blood coagulation requires the complex interaction of about 20 proteins, called clotting factors. Low levels of factor 8 result in prolonged blood clotting.

What are the symptoms of hemophilia B?
Symptoms of hemophilia B include prolonged bleeding, bleeding into the joints, joint swelling, joint pains, knee pain, bleeding gums, fatigue, nose bleeding, excessive bruising, blood in the stool, black stool, and a rash that looks like bruises or broken blood vessels.

How does the doctor treat hemophilia B?
Treatment for hemophilia B includes intravenous infusions of factor 9, fresh frozen plasma, epsilon aminocaproic acid, and gene therapy.