Thank you to the National Hemophilia Foundation (NHF), the Hemophilia Federation of America (HFA) and the World Hemophilia Foundation (WHF) for providing information for this section of the website.
A bleeding disorder is a flaw in the body’s blood clotting system. Blood clotting (also known as coagulation) is the process that controls bleeding by changing blood from a liquid to a solid state.
Clotting is a complex process involving as many as 20 different plasma proteins often called blood clotting factors. In people with bleeding disorders these clotting factors are missing or do not work as they should. This causes them to bleed for longer periods of time than people whose blood factor levels are normal or work properly. Persons with bleeding disorders won’t bleed to death from minor injuries, and their blood does not flow faster – these are myths.
Approximately 400 babies are born with hemophilia each year in the United States.