Practice English Speaking&Listening with: What causes anovulation?

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The most frequent cause of anovulation

is polycystic ovary syndrome when follicles with maturing eggs grow,

but ovulation (rupture of the follicle)

does not occur and the egg is not released from the follicle.

This is caused by different hormonal disorders.

Pregnancy occurs after stimulation of ovulation in most cases.

The Description of What causes anovulation?