This document provides an overview of polycystic ovarian syndrome (PCOS). It defines PCOS as a hormonal disorder causing enlarged ovaries with small cysts. It discusses the prevalence of PCOS, affecting 8-20% of women of childbearing age. The causes of PCOS include excess insulin, heredity, and low-grade inflammation. Symptoms include irregular periods, acne, excess hair growth and obesity. Long term risks include diabetes, heart disease and cancer. The document outlines diagnostic criteria and tests used to diagnose PCOS. Treatments discussed include lifestyle changes, medication and surgery.