When Do Pms Symptoms Start?

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What Is It?

Premenstrual syndrome (PMS) is a collection of physical, psychological and emotional symptoms that many women experience during the one to two weeks before a menstrual period. These symptoms disappear soon after the start of menstrual bleeding.

Several theories have been proposed to explain why PMS occurs. The most popular explanation for PMS is that these symptoms are related to cyclic changes in female sex hormones, pituitary hormones, prostaglandins and certain brain chemicals...

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