A menstrual cycle in which ovulation fails to occur. This means that you seem to have a normal cycle in that you have menstruation, but you do not releas an egg or ovulate. Anovulatory cycles tend to occur occasionally but are most common during adolescence and in the years before menopause (perimenopause).
Other causes may include hormonal imbalances, eating disorders, stress, and diet/exercise.
Clomiphene citrate (Clomid) is often a good first choice for an anovulatory women.