Menstruation, or period, is the shedding of the endometrium (uterine lining). Every month the body prepares itself for pregnancy; when fertilization does not occur the uterus sheds its lining. Some women may experience premenstrual syndrome (PMS), which refers to a range of physical and emotional symptoms that accompany the menstrual cycle.Others may experience such conditions as dysmenorrhea, difficult menstrual flow or pain during menstruation. Periods typically begin with puberty around age 12-13, and continue until menopause (about age 51).

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