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Menstruation is the periodic and cyclic bleeding from the uterus, accompanied by the release endometrium.
Menstrual cycle length is the distance between the start date of last menstrual period and the start of the next menstruation. Days beginning the first day of bleeding is called cycle. The length of a normal menstrual cycle or menstrual cycle is considered a classic is 28 days, but the variation is wide enough, not only among some women but also on the same woman. Also on twin brothers even, the cycle is not too similar. The length of the menstrual cycle is influenced by one's age. Average length of menstrual cycle on 12-year-old girl is 25 days, in women aged 43 years 27 days, and in women age 55 years 52 days. So, the actual length of the menstrual cycle of 28 days is not often encountered. Usual cycle length in humans is 25 to 32 days, and approximately 97% of women ovulating menstrual cycles ranging from 18 to 42 days. If the cycle is less than 18 days or more than 42 days and not regular, the cycle usually does not ovulate (anovulator).
Long period is usually between 3 to 5 days, there are 1 to 2 days followed by blood a little later, and there are up to 7 to 8 days. In each woman's menstrual period is usually long fixed.
Age of teenage girls at the time the first time got my period (menarche) varies widely, between 10 to 16 years, but the average is 12 years. Statistics show that the age of menarche is influenced by heredity, state of nutrition, and general health. Menarche occurred in the midst of puberty, namely the transition from children to adults. After puberty, women entering the reproductive period, that period where he can obtain offspring. This reproductive period lasts 30 to 40 years and ended at the time of menopause or tray (menopause).