Researchers have determined that there is no conclusive evidence to support the existence of pre-menstrual syndrome (PMS).
Analysing 41 research studies that tracked women’s daily moods through their menstrual cycles, only six showed any association between negative moods and the pre-menstrual phase.
Researchers also found that some of those studies may have been biased because study participants were not “blinded” to the purpose of the study.
Belief in the existence of PMS is thought to be the result of culturally ingrained misconceptions regarding women’s menstrual cycles that have little basis in scientific fact or evidence.
Read more at University of Toronto