Hemophilia is an inherited bleeding disorder that only occurs in males.

A male with hemophilia is missing a protein clotting factor, which helps the blood to form clots. Normal blood coagulation requires the complex interaction of about 20 different clotting factors. Low levels of one of these clotting factors result in prolonged blood clotting.

There are two main forms of hemophilia:

• Hemophilia A
• Hemophilia B