VWD is classified into categories based on whether a person has a low level of von Willebrand factor, a defective type of von Willebrand factor, or both. The disease is divided into two forms: inherited and acquired. Type 1, Type 2, and Type 3 are the three major inherited von Willebrand disease types. VWD type 2 is further classified into 2A, 2B, 2M, and 2N.