Polycystic ovary syndrome (PCOS) Polycystic ovary syndrome (PCOS) is a condition that affects a woman’s hormone levels. PCOS affects up to almost 27 percent of women during their childbearing years. It involves cysts in the ovaries, high levels of male hormones, and irregular periods. Many women have PCOS but don’t know it. In one study, up to 70 percent of women with PCOS hadn’t been diagnosed. The lack of ovulation alters levels of estrogen, progesterone, FSH, and LH. Estrogen and progesterone levels are lower than usual, while androgen levels are higher than usual. Extra male hormones disrupt the menstrual cycle,...
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