A new study suggests that premenstrual syndrome is only a myth, including data which suggests mood changes aren't as closely tied with a woman's monthly cycle as many have assumed.
A team led by Dr. Sarah Romans of the University of Otago in New Zealand reviewed 47 studies that followed women's moods across the menstrual cycle.
Little more than half of the studies (53 percent) found any link between menstruation and bad mood.
