What Is A Bleeding Disorder?Bleeding disorders are conditions in which the blood does not clot normally because certain proteins in the blood are missing or do not work properly. Von Willebrand DiseaseVon Willebrand disease (VWD) is a disorder in which the blood does not clot properly. Blood contains many proteins that help the blood clot when needed. One of these proteins is called von Willebrand factor (VWF). People with VWD either have a low level of VWF in their blood or the VWF protein doesn’t work the way it should. There are three types of VWD: type 1 (the most common and mildest form o…