A common condition, polycystic ovary syndrome (PCOS) impacts anywhere from 5% to 15% of the female population, depending on what diagnostic criteria is used. The most common endocrinopathy in women, PCOS has associations with reproductive, dermatologic, and psychological systems as well as metabolic health and impacts women from adolescence to menopause. Heather Gibson Huddleston, MD, discusses the basics of PCOS, diagnostic criteria and the impact of weight and BMI.