Premenstrual Dysphoric Disorder (PMDD) (cont.)
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PMS and PMDD are believed to be caused by a complex interaction of the hormones produced by the ovaries during a normal menstrual cycle (estrogen and progesterone) with neurotransmitters (chemical messengers) in the brain. Serotonin is a neurotransmitter that is believed to be important in the development of PMDD, and PMDD may be the result of alterations in brain serotonin levels. The exact mechanism by which neurotransmitters and hormones interact to cause PMDD is not yet understood.
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