Premenstrual syndrome (PMS ) refers to the physical and psychological symptoms that a person may experience before their menstrual period. These can include bloating, headaches, mood changes, and more. Premenstrual syndrome, commonly known as PMS is characterized by a set of physical, emotional, and behavioral symptoms that usually occurs a week or two before the menses. Premenstrual Syndrome ( PMS ) involves a variety of physical and emotional symptoms occurring before menstruation. Learn about its causes, risk factors, symptoms, effective treatments, and preventive measures to manage PMS better.