I need to know what is von willebrand's disease?

Bleeding disorder. Von willebrand disease is a condition that can cause extended or excessive bleeding. The cause of von willebrand disease is a deficiency in or impairment of a protein called von willebrand factor, an important component in your blood-clotting process. In general, it takes longer for people with von willebrand disease to form clots and stop bleeding when they're cut.