The American Psychiatric Association is now considering the possibility of including premenstrual dysphoric disorder (PMDD) in the DSM-V as a new category, rather than listing a set of criteria for PMDD in the appendix (as in DSM-IV).  The diagnostic criteria remain relatively unchanged.  Many feel that the Inclusion of PMDD as a distinct diagnostic category will lead to greater legitimacy for the disorder and will encourage the growth of evidence-based research in this area.