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Menstruation is the monthly vaginal bleeding that occurs in reproductive age women. The menstrual cycle refers to the monthly hormonal cycle that results in the shedding of the lining of the uterus, termed menstruation.

Paula Hillard

Google Knol Menstruation and MenarchePaula J. Adams Hillard, MDProfessor, Department of Obstetrics and GynecologyStanford University School of MedicineStanford, CA 94035-5317