Polycystic Ovarian Syndrome Polycystic ovarian syndrome (PCOS) is a hormonal disorder in which a woman's body produces abnormally high levels of androgens and prevents the ovaries from producing enough progesterone, which is necessary for a normal menstrual cycle.
This results in undeveloped egg follicles, which turn into small cysts in the ovaries that prevent ovulation. PCOS affects approximately 4-10% of women in her prime conception years and is a leading cause of infertility.