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Ovulatory Dysfunction is the absence of ovulation or abnormal ovulation activity. This condition is a major cause of infertility. It is often associated with irregular menstrual cycles and is usually caused by hormonal disorders. Adrenal and ovarian hormone abnormalities are the most frequent cause of ovarian dysfunction, and the most common example of this is Polycystic Ovarian Syndrome (PCOS). It is estimated that 5 to 10 per cent of Australian women have PCOS, but many don't know they have it.