It first occurs at the age of 12-14, but in a number of cases menstruation may begin earlier or later, depending on the individual features of the body. In the absence of diseases of the sexual sphere, the period of onset of the first months on quality of life has no effect
The menstrual cycle involves certain stages. At the beginning of the cycle, the mucosa of the uterus begins to thicken, preparing to attach a fertilized oocyte to it, simultaneously growing up in the ovaries. In the middle of the cycle, ovulation occurs, and if the oocyte meets with a sperm, fertilisation occurs. In this case, the problem of why the period goes, ceases to worry, as pregnancy ensues. It is extremely rare to exclude from this rule and menstruation continues after fertilization of the egg.
If conception does not occur, then by the end of the cycle the thickened endometrium begins to peel off and leave the body in the form of genetic bleeding. Repeated monthly on average once every 22-28 days, but the cycle can be longer. Among the reasons why month-olds go long are hormonal disorders, gynecological diseases, problems with the nervous system, improper nutrition. In this case, a specialist consultation is required.
Menstruation continues throughout that period as long as the female body is able to conceive and bear a child. The cessation of menstruation is indicative of the onset of climax and on average occurs at 50-55 years. Against the background of disease or stress, climax can start earlier.