<unk>  is when the ovaries do not release an oocyte during a menstrual cycle. Therefore, ovulation does not take place. However, a woman who does not ovulate at each menstrual cycle is not necessarily going through menopause. Chronic<unk>  is a common cause of infertility. In addition to the alteration of menstrual periods and infertility, chronic<unk>  can cause or exacerbate other long term problems, such as hyperandrogenism or osteopenia. It plays a central role in the multiple imbalances and dysfunctions of polycystic ovary syndrome. During the first two years after menarche 50% of the menstrual cycles could be anovulatory cycles. It is in fact possible to restore ovulation using appropriate medication, and ovulation is successfully restored in approximately 90% of cases. The first step is the diagnosis of<unk> . The identification of<unk>  is not easy; contrary to what is commonly believed, women undergoing<unk>  still have (more or less) regular periods. In general, women only notice that there is a problem once they have started trying to conceive. Temperature charting is a useful way of providing early clues about<unk> , and can help gynaecologists in their diagnosis.
Anovulation
Anovulatory cycle
Gonadotropin-resistant ovary syndrome
Lactational amenorrhea
Polycystic ovary syndrome
Exercise amenorrhoea
Progestin-induced virilization
Primary ovarian insufficiency