Polycystic ovary syndrome is a condition where you have few, unusual or very long periods. It often results in having too much of a male hormone called androgen. Many small sacs of fluid develop on the ovaries. They may fail to regularly release eggs. The exact cause of PCOS is unknown. There is evidence that genetics play a role. Several other factors also play a role in causing PCOS: Higher levels of male hormones called androgens: High androgen levels prevent the ovaries from releasing eggs (ovulation), which causes irregular menstrual cycles. Treatments include birth control pills to regularise periods, medication called metformin to prevent diabetes, statins to control high cholesterol, hormones to increase fertility and procedures to remove excess hair.