Premenstrual Syndrome (PMS) is a group of symptoms that relate to the menstrual cycle. PMS symptoms occur in the week or two weeks before menstruation (also known as monthly bleeding or "period"). Symptoms usually go when menstruation begins. While any woman of childbearing age can be affected, it most likely occurs between a woman's late 20s and early 40s, where its incidence is up to 75%. It is more often experienced by women who have given birth, a family history of a major depressive disorder, or a medical history of postpartum depression. The exact causes of PMS are unknown, and it may be associated with social, cultural, biological and mental factors. |