These cysts are tiny fluid filled sacs on the ovary, each about four millimetres across. Their correct name is follicles and if they grow under the influence of the correct hormones one of them will become particularly large and contain the egg. At the middle of the month this follicle bursts releasing the egg (ovulation). In most women, mild polycystic ovaries only lead to minor problems associated with their periods but some stop having menses.

PCOS is mainly caused by hormone imbalances and these imbalances cause various problems depending on the severity of the hormonal imbalances and production of androgens.

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