Epidemiology
The number of women who experience PMS depends entirely on the stringency of the definition of PMS. The World Health Organization estimates that 199 million women have premestrual syndrome as of 2010 (5.8% of the female population). While 80% of menstruating women have experienced at least one symptom that could be attributed to PMS, estimates of prevalence range from as low as 3% to as high as 30%.
Mood symptoms such as emotional lability are both more consistent and more disabling than somatic symptoms such as bloating. A woman who experiences mood symptoms is likely to experience these symptoms consistently and predictably, whereas physical symptoms may come and go. Most women find that physical symptoms related to PMS are less disruptive than emotional symptoms
Read more about this topic: PMS