PMS refers to a wide range of physical or emotional symptoms that typically occur about 5 to 11 days before a woman starts her monthly menstrual cycle.
An exact cause of PMS has not been identified. However, it may be related to social, cultural, biological and psychological factors. There are changes to hormone levels that occur premenstrually that trigger changes in brain chemistry and kidneyl function. These changes are responsible for many of the symptoms of PMS.
PMS is estimated to affect up to 75% of women during their childbearing years.