Polycystic Ovarian Syndrome (PCOS) is the most common cause of infertility in women. It is characterized by oligoamenorrhea, hyperandrogenism, and polycystic ovaries. PCOS results from abnormal pituitary-ovarian-adrenal interactions that cause excess androgen production and reduced fertility. Women with PCOS have an increased risk of insulin resistance, diabetes, heart disease, and obesity. The diagnosis of PCOS requires hyperandrogenism, ovarian dysfunction, and the exclusion of other disorders.