Polycystic ovary syndrome (PCOS) is a condition in which the ovaries produce abnormal amounts of androgens (a group of hormones that includes testosterone). Signs and symptoms can include: irregular, light, or missed periods; difficulty getting pregnant; excessive hair growth (hirsutism) on the face, chest, back, or buttocks; weight gain; thinning hair or hair loss on the head; and oily skin or acne. PCOS has also been associated with the risk of developing type 2 diabetes and high cholesterol levels.