Ovulation occurs after the monthly flow at around the 14 – 18 days of your menstrual cycle. Ovulation occurs every month just as the menstrual flow does. But we have the absence of ovulation and that is called Anovulation.
Anovulation is when the ovaries do not release an oocyte (egg) during a menstrual cycle. Therefore, ovulation does not take place. A woman who does not ovulate at each menstrual cycle is not necessarily going through menopause. Chronic anovulation is a common cause of infertility.
In addition to the alteration of menstrual periods and infertility, chronic anovulation 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 (the beginning of menstruation) 50% of the menstrual cycles could be anovulatory
A common cause of this is having hormonal imbalance in women