Polycystic ovary syndrome, widely known as PCOS, is an endocrine system disorder that affects women in their reproductive years. Small fluid-filled sacs develop on the ovaries.

It is also known as or Stein-Leventhal syndrome.

Symptoms include changes to the menstrual cycle and excess hair growth. Untreated, it can lead to infertility and other complications. The exact cause is unknown.

Early diagnosis and treatment are recommended. Weight loss may also decrease the risk of associated health risks, such as insulin resistance, type 2 diabetes, high cholesterol, heart disease, and high blood pressure.