- The Other . Bleeding Disorder.. What is the most common inherited bleeding disorder, the one that affects many millions of people around the world, and up to two million in the United States You may be surprised to hear that it is not haemophilia. It is von Willebrand disease, a related disorder that few people have heard of, unless they have it or know someone who does. Why is such a common ...www.haemophilia.org.za/Vonwil2.htm