A more severe form of PMS, known as premenstrual dysphoric disorder (PMDD), also known as late luteal phase dysphoric disorder, occurs in a smaller number of women and leads to significant loss of function because of unusually severe symptoms. more severe form of PMS, known as premenstrual dysphoric disorder (PMDD), also known as late luteal phase dysphoric disorder, occurs in a smaller number of women and leads to significant loss of function because of unusually severe symptoms.