Polycystic ovary syndrome (PCOS) is a classic female infertility problem affecting an estimated 6-10% of all women and many of whom are unaware of the problem. PCOS is the single most common endrocrinologic abnormality that affects women. It is a disease that affects women from adolescence to menopause. Patients with PCOS are seen by a variety of specialists, including: reproductive, medical and pediatric endocrinologists; general internists, and dermatologists. This book is an edited collection from diagnosis and epidemiology of PCOS to clinical evaluation. There are additional factors that complicate this disease, such as insulin levels and obesity. Women with PCOS are known to be at a high risk for type 2 diabetes.