Premenstrual syndrome (PMS) is an extremely common disorder of women that occurs previous to the menstrual cycle, producing a wide range of physical and emotional symptoms. In fact, up to 75% of women experience some type of PMS. The symptoms typically start a week previous to the start of the monthly cycle and stop within the first 2 days of beginning the cycle. The symptoms tend to re-appear monthly and may vary in intensity from month to month. PMS tends to be most common from the late 20’s to the early 40’s.