PCOS is a common disorder that can affect teenagers and young women. About 5 to 8 percent of all women have PCOS. The cause of PCOS is not completely understood. It is believed that abnormal levels of the pituitary hormone LH (luteinizing hormone) and high levels of male hormones (testosterone) interfere with the normal function of the ovaries. In PCOS, ovulation doesn't happen every month, which causes infrequent periods.
Symptoms can include:
