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Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
Menstruation starting as young as 8 years would still be considered normal. [2] The average age of the first period is generally later in the developing world, and earlier in the developed world. [3] The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women.
In some Indian communities, young women are given a special menarche ceremony called Ruthu Sadangu. [45] The Mescalero Apaches place high importance on their menarche ceremony and it is regarded as the most important ritual in their tribe. Each year, there is an eight-day event celebrating all of the girls who have menstruated in the past year.
For the study, researchers followed 1.2 million women who didn't have heart disease, stroke, or cancer, and broke them into groups based on when they got their first period.
Starting menstruation is an important sign of health. A new study shows that the trend of children starting at an earlier age may point to worrying conditions.
In fact, anytime between 8 and 16 is normal. In Canada, the average age of menarche is 12.72, [59] and in the United Kingdom it is 12.9. [60] The time between menstrual periods (menses) is not always regular in the first two years after menarche. [61] Ovulation is necessary for fertility, but may or may not accompany the earliest menses. [62]
One-third of women will experience abnormal uterine bleeding in their life. Normal menstrual cycle has a frequency of 24 to 38 days, lasts 7 to 9 days, so bleeding that lasts longer could be considered abnormal. Very heavy bleeding (for example, needing to use 1 or more tampons or sanitary pads every hour) is another symptom. [19]
While the normal human menstrual cycle typically lasts 4 weeks (28 days, range 24–35 days) and consists of a follicular phase, ovulation, and a luteal phase followed by either menstruation or pregnancy, the anovulatory cycle has cycle lengths of varying degrees.