PMDD is short for premenstrual dysphoric disorder, a severe form of premenstrual syndrome, according to theÂ Mayo Clinic. PMDD can cause depression, fatigue, appetite changes, headaches, muscle pain and several other symptoms. Unlike PMS, PMDD is often so severe that it affects the woman's ability to work and go about normal daily activities.
Premenstrual dysphoric disorder usually begins to affect women 7 to 10 days prior to the start of menstruation. It can continue into the first few days of menstruation. PMDD occurs in two to 10 percent of women, notes WebMD. Several treatments can be used to treat PMDD, including birth control pills, dietary changes, herbal supplements and antidepressants.