This study examined the symtom patterns of women seeking help for Premenstrual Syndrome (PMS) complaints Seven women who were less than 35 yrs, within 10% of ideal body weight and who had experienced a full-term pregnancy, completed a daily health diary during an ovulatory menstrual cycle In the luteal phase, symptom summary scores of the PMS group increased (P<0 05) and were markedly higher (P<0 5) from baseline acyclic scores of four ovulatory women who denied menstrual-related distress To examine seventy changes in individual symptoms, a total of 399 cases representing 57 symptoms from the seven 45-day diaries were evaluated for menstrual cycle entrainment Of the 246 symptoms that met the criteria for a cycle phase change (62%), the classic PMS pattern of low/high seventy was the most common (40%) Seven different subtypes of the PMS pattern were identified, four of these subtypes demonstrated a seventy score elevation at ovulation as well as during the premenstruum For individual women, the majority of symptoms (65%) displayed only two pattern types, suggesting a common rhythmic entrainment of symptom intensity