PMS is a group of symptoms that include physical (cramps, breast pain), emotional (tearful, mood swings) and behavioral (food cravings, fatigue) changes. These tend to occur prior to and during monthly menstruation. Although 80% of women have some changes during their cycle, as many as 10-20% of women find that these symptoms affect their lives, work, and relationships. If so -it is recommended to discuss these changes with your healthcare provider.