Frontiers Endometriosis Is a Cause of Infertility. Does Reactive Oxygen Damage to Gametes and Embryos Play a Key Role in the Pathogenesis of Infertility Caused by Endometriosis? Hormonal imbalances affect up to 80% of womenand they're one of the most common, yet treatable, causes of infertility. When hormones are out of sync, they can disrupt ovulation, menstrual cycles, and Frontiers Mechanisms of endometrial aging: lessons from natural conceptions and assisted reproductive technology cycles How Thyroid Disease Can Affect A Womans Menstrual Cycle Dr Hagmeyer