The Finnish physician Erik von Willebrand was the first to describe von Willebrand disease (VWD).

Von Willebrand disease may be hard to diagnose. Low Von Willebrand factor levels and bleeding do not always mean you have Von Willebrand disease.

http://www.nlm.nih.gov/medlineplus/ency/article/000544.htm

von Willebrand disease results from inadequate von Willebrand factor. This problem is a blood clotting disorder.

Hemophilia is one disease in which blood does not clot normally.

von Willebrand's Disease

Many people with VWD have mild symptoms or symptoms that can be confused with other bleeding disorders, making it difficult to diagnose