Premenstrual syndrome (PMS) is a set of physical, emotional and behavioral symptoms that occur during the week preceding menstruation and which alleviate when the menstrual flow begins. PMS affects millions of women during their reproductive years. Mild symptoms, which usually do not interfere with daily activities, are experienced occasionally by almost all ovulatory women. Between 8-30% of ovulatory women suffer from moderate to severe PMS symptoms, which may even require treatment. The more severe form of PMS, premenstrual dysphoric disorder is considered to affect up to 8% of ovulatory women. This severe form is associated with severe disruptions in work function, family, or social relationships. To date, therapeutic interventions are insufficient and ranges from stress reduction and lifestyle changing to hormonal therapies and the use of psychotropic medications. While traditional medications do not necessarily offer satisfactory alleviation of PMS symptoms homeopathy can offer a significant alleviation of PMS symptoms for an extended period of time.