smoking) does not necessarily cause infertility, and even if a woman is definitely infertile, the infertility cannot definitely be blamed on any single risk factor even if that risk factor is (or has been) present.

Hormonal dysfunction

Ovulatory hormonal disorders are the greatest single contributing factor to female infertility. Anovulation, or the failure to ovulate, is primarily caused by insufficient hormone levels, including low estrogen levels, insufficient

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