Background: Premenstrual Syndrome (PMS) and Premenstrual Dysphoric Disorder (PMDD) are disorders experienced by women in the luteal phase of the menstrual cycle that interfere with daily activities. This study aims to determine the prevalence of Premenstrual Syndrome (PMS) and Premenstrual Dysphoric Disorder (PMDD) symptoms in Riau University female students. Methods: This study used a descript…