Premenstrual syndrome (PMS) is a collection of physical, psychological, and emotional symptoms related to a woman’s menstrual cycle. While most women of child-bearing age (about 80 percent) have some Premenstrual symptoms, women with PMS have symptoms of “sufficient severity to interfere with some aspects of life”. Such symptoms are usually predictable and occur regularly during the two weeks prior to menses. The symptoms may vanish after the menstrual flow starts, but may continue even after the flow has begun.