Dysmenorrhea: It's from secretion of substances called prostaglandins, elaborated to prepare the uterus for implantation even if there was no conception. But it's elaboration is thought to be the cause of premenstrual symptoms including cramps, headache, nausea. See http://www.Nlm.Nih.Gov/medlineplus/ency/article/003150.Htm.
Answered 9/28/2012
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