Physiological amenorrhea, ie complete absence of menstruation in a woman for more than six months not uncommon. The most common physiological amenorrhea occurs during pregnancy and nursing
Breastfeeding - a personal choice
feeding. Physiological amenorrhea is also in children, adolescents and older women.
Physiological amenorrhea during pregnancy
Physiological amenorrhea (ie a complete lack of menstruation) during pregnancy is associated with the fact that the mucous membrane of the uterus is not rejected, as it occurs during menstruation. This happens because hormonal support at the end of the next menstrual cycle after conception occurred, not only does not decrease (this is the reason for the rejection of the mucosa and the onset of menstruation), but, on the contrary, increased.
Once the embryo is embedded in the wall of the uterus, its shell start to allocate the pregnancy hormone - human chorionic gonadotropin (hCG). HCG stimulates the secretion of the female sex hormone progesterone
Progesterone - norm and pathology
Whose main task is to suppress the contraction of smooth muscles of the uterus, which could lead to rejection of the embryo with the mucous membrane of the uterus.
Therefore, during pregnancy, menstruation does not happen - the rejection of the mucous membrane of the uterus during this period always leads to abortion.
Physiological amenorrhea during breastfeeding
After giving birth, the pituitary gland starts secreting the hormone prolactin, which inhibits the secretion of pituitary gonadotropins (TG) - follicle-stimulating and luteinizing hormone (FSH and LH). The main function of FSH is the hormone support follicle maturation, as well as this hormonal support is insufficient follicle matures, the egg is not released from the ovary (ie, no ovulation), in connection with which the fertilization impossible.
But to physiological amenorrhea
The absence of menstruation (amenorrhea) - ambiguous symptom
could become a reliable protection against unwanted pregnancy, breast-feeding should take place regularly. Mixed feeding (when, after applying to finish feeding the baby breast milk formula) is not sufficient protection, since it is produced is not enough. After the introduction of the first foods
Introduce solid foods - how not to be mistaken with a choice of products?
(5-6 months) protection against unplanned pregnancy is also reduced.
Physiological amenorrhea in childhood and adolescence
Physiologically amenorrhea is typical for children and adolescents. It is connected with the fact that inherent in utero ovarian egg girls are not ready yet to mature.
At the age of 11-12 years under the influence of female hormones estrogen increase the girl's body weight, formed the primary sexual characteristics of female type. When the weight of her body reaches a certain level, the cerebral cortex sends a signal to the hypothalamus, which is involved in the work by secreting hormones that stimulate the secretion of pituitary gonadotropins (TG) - FSH and LH. Under the influence of FSH egg matures in the ovary, and under the influence of LH, it breaks the follicles, which mature and released from the ovary. Stopping hormonal support leads to the first menstrual period - menarche.
Regular menstruation sometimes installed at once - it depends on what at first neurohormonal system malfunctions. But in most cases, regular menstrual cycles is set for about a year.
Physiological amenorrhea in the elderly
Physiological amenorrhea in old age (menopause) occurs on average at age 50. This reduces the function of the ovaries, they begin to produce enough female hormones. This increases the stimulatory effect on the pituitary ovaries as increased secretion of gonadotropins (TG) - FSH and LH.
The lack of female sex hormones estrogen leads to the fact that more and more menstrual cycles become irregular (no ovulation), that is during the menstrual cycle does not occur yield mature egg from the ovary. Menstrual cycles become irregular, often very long, but sometimes, on the contrary, shorter. But gradually suppressed and the function of the pituitary gland, which leads to menopause. The lack of female sex hormones leads to a complete restructuring of the metabolism of women. Particularly affected mineral metabolism: there is leaching of calcium from the bone, which leads to its increased fragility and propensity to fractures - osteoporosis.
Physiological amenorrhea - a natural state of women who do not require treatment.