Premenstrual Syndrome (PMS) includes irritability, mood swings, water retention, bloating, and headaches. Interestingly, PMS can account for more than 50% of the sick leave women take at work. Research by the National Institute of Health shows that women under stress have moderate to severe symptoms during menstruation. Solutions? Pick a sport - running, tennis, aerobic dancing, or any other kind of intensive exercise! This boosts serotonin levels, also known as the ‘happy’ hormone, which helps to reduce or even prevent PMS. Plus, exercise is a good stress buster too!