Polycystic Ovary Syndrome (PCOS) is a condition, which causes hormonal disorder in women, causing the enlargement of ovaries with small fluid-filled sacs, called cysts, inside them. Periods happen when the ovaries release the eggs. The uterine wall that builds up to protect the egg sheds. Together they release the egg and the uterine wall cause the menstrual bleeding. In a healthy condition, ovaries produce the female hormones, estrogen and progesterone, and a small amount of male hormone called androgen. These three hormones cause menstrual periods, which is the periodic release of eggs (ovulation). Polycystic Ovary Syndrome triggers the excessive formation of androgen, which causes an imbalance of these 3 hormones.