A menstrual disorder is a physical or emotional problem that interferes with the normal menstrual cycle, causing pain, unusually heavy or light bleeding, delayed menarche, or missed periods.
Typically, a woman of childbearing age should menstruate every 28 days or so unless she is pregnant or moving into menopause. But numerous things can go wrong with the normal menstrual cycle, some are the result of physical causes, others emotional. These include amenorrhea, or the cessation of menstruation, menorrhagia, or heavy bleeding, and dysmenorrhea, or severe menstrual cramps. nearly every woman will experience one or more of these menstrual irregularities at some time in her life.