The conventional treatment for missed or absent periods is oral contraceptives, which of course doesn't treat the underlying cause of anovulation. (taliand.com)
On the female side, problems with anovulation (a lack of ovulation), blocked fallopian tubes, or inability of an embryo to implant and establish a pregnancy in the uterus can all result in infertility. (harryfisch.com)
luteal insufficiency: failure of the corpus luteum to produce adequate amounts of progesterone upon ovulation; often caused by anovulation. (yourhormonebalance.com)