If a 26 years old woman has never had a period, then she is probably experiencing hypogonadism (failure of the reproductive function). The cause of hypogonadism originates somewhere in the axis hypothalamus-pituitary gland-ovaries. Primarily, a woman with hypogonadism experiences no ovulation and thatâs why there is no menstruation (period). If the problem is located in the ovaries it is called "primary hypogonadism". If the problem is located in the pituitary gland it is called "secondary hypogonadism". And, if the problem is located in the hypothalamus it is called "tertian hypogonadism". Female hormones (estrogen and progesterone), taken from birth control pills, can cause only a âperiodâ but not ovulation. A âperiodâ without ovulation is not a real period but is termed pseudomenstruation (false period). It is believed that after coming off the female hormones, the normal function of the axis hypothalamus-pituitary gland-ovaries will establish itself spontaneously. If contraceptive pills do not help ovulation, stimulators like clomifen are indicated. Some types of hypogonadism are genetically conditioned and they canât be treated.