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Pre-menstrual syndrome (PMS) is that lovely time during a woman’s menstrual cycle when her hormones are thrown out of balance, causing a storm of psychological symptoms such as anxiety, low mood, irritability and heightened emotions.

Well, at least, that’s what we’ve been led to believe. But our understanding of PMS is problematic, according to a TED talk by Robyn Stein DeLuca, research assistant professor of psychology at Stony Brook University. And here's why:

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