Why does a man not get periods

When your period never comes

Usually all girls and women of reproductive age have their menstrual period once a month. The blood flow ensures that the uterine lining that forms within the month is broken down and flushed out of the uterus if the woman's egg has not been fertilized. In this way, the mucous membrane can grow back in the next month and prepare the body for a possible pregnancy.

How heavy menstruation is differs from woman to woman. In addition, the intervals between menstrual periods vary between 21 and 35 days and can also change in the course of life or due to certain circumstances.

Genetic defects and malformations as the cause

While irregularities in the cycle are natural, it happens in one to two percent of women that the menstrual period is not only delayed in the fertile phase, but does not occur at all. Such a menstrual disorder is known as amenorrhea.

If a girl is 16 years old or two years after the start of puberty, it is known as primary amenorrhea. This can be caused by genetic defects in the genome that prevent the reproductive organs from being fully developed. For example, in the so-called vaginal atresia, the uterus and vaginal system may be missing.

Another example is Turner Syndrome. Those affected only have one instead of two functional X chromosomes. In these women, the ovaries do not develop adequately, making them sterile and therefore not having a menstrual period.

The so-called Mayer-Rokitansky-K├╝ster-Hauser syndrome (MRKHS) is another possible cause of primary amenorrhea: although the ovaries, external vulva and breasts are normally developed, the internal vagina and uterus are not. As a result, there is no connection between the uterus and the vaginal outlet and the women cannot get their periods or be fertilized.

In addition, girls with diseases such as hymenoid atresia cannot menstruate because their vaginal opening is completely closed and the menstrual blood collects in their vagina.

Chaos in the hormonal balance

Certain diseases can also cause primary amenorrhea if they alter the woman's hormonal balance. Because the menstrual cycle is controlled by a complex interplay of hormones. If this interaction is disturbed or if one of the actors is missing, affected girls and women never get their period.

One reason for this can be the so-called Kallmann syndrome. Women with this congenital developmental disorder of the gonads have primary amenorrhea because, among other things, the hormone levels of the luteinizing hormone and the follicle-stimulating hormone are reduced.

In addition, hormonal disorders also occur, for example, in the congenital adrenogenital syndrome (AGS): too many male sex hormones are formed in the ovaries and the adrenal cortex. As a result, the sex organs of the affected girls develop male characteristics as early as childhood - menstruation is then no longer possible after puberty.


March 26, 2021

- Anna Bolten