Dictionary of Biological Psychology
(US: amenorrhea) Absence or failure of menstruation (see MENSTRUAL CYCLE). The menstrual cycle is typically, in humans, a 28-day period, though there is considerable individual variation in this. Absolute loss of menstruation can occur for a variety of reasons. For example, significantly reduced food intake, either through unavoidable starvation or that associated with ANOREXIA NERVOSA, produces amenorrhoea.
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