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http://www.hormonehelpny.com/column/pcos.htm#THE%20FOUR%20(OR%20FIVE)%20FEATU...
GETTING THE CYCLE BACK IN ORDER
Since periods are an inconvenience, some women ask, “what is wrong with not having them?” It is not that periods are good in themselves but rather that regular menses are a sign that hormonal mechanisms are functioning properly.
Irregular periods occur commonly with PCOS because ovulation does not occur every month as it is supposed to. The most common pattern is for periods to come infrequently. However some women with PCOS have prolonged and heavy periods. When ovulation does not occur, the ovary does not make progesterone during the second half of the cycle. Progesterone is necessary to prepare the uterus to have a normal period. When months go by with no period, the endometrium (uterine lining) can get thicker and thicker. Then when a period does come, either on its own or from medication, it is like having several at once: heavy, sometimes with clots and often crampy.