Menarche

Menarche ( /mɨˈnɑrkiː/ mə-NAR-kee; Greek: μήν mēn "moon" + ἀρχή arkhē "beginning") is the first menstrual cycle, or first menstrual bleeding, in female humans. From both social and medical perspectives it is often considered the central event of female puberty, as it signals the possibility of fertility.

Girls experience menarche at different ages. The timing of menarche is influenced by female biology, as well as genetic and environmental factors, especially nutritional factors. The average age of menarche has declined over the last century but the magnitude of the decline and the factors responsible remain subjects of contention. The worldwide average age of menarche is very difficult to estimate accurately, and it varies significantly by geographical region, race, ethnicity and other characteristics. Various estimates have placed it at 13. Some estimates suggest that the median age of menarche worldwide is 14, and that there is a later age of onset in Asian populations compared to the West. The average age of menarche is about 12.5 years in the United States, 12.72 in Canada, 12.9 in the UK and 13.06 ± 0.10 years in Iceland. A study on girls in Istanbul, Turkey, found the median age at menarche to be 12.74 years.

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Other articles related to "menarche":

Female Athlete Triad - Triad Components - Amenorrhea
... Primary amenorrhea is characterized by delayed menarche ... Menarche is the onset of a girl’s first period ... Delayed menarche may be associated with delay of the development of secondary sexual characteristics ...
Menarche - Culture - Rites of Passage
... had rites of passage for a girl experiencing menarche ... The Ulithi tribe of Micronesia call a girl's menarche kufar She goes to a menstrual house, where the women bathe her and recite spells ... Some Sri Lankans note the time and day of menarche ...
Amenorrhoea - History
... In preindustrial societies, menarche typically occurred later than in current industrial societies ... After menarche, menstruation was suppressed during much of a woman's reproductive life by either pregnancy or nursing ... Reductions in age of menarche and lower fertility rates mean that modern women menstruate far more often than they did under the conditions prevalent for most of human evolutionary history ...
Xenoestrogen - Effects - Precocious Puberty - Fish Contamination
... Concentrations of maternal serum PCB and DDE and their daughters' age at menarche were reviewed ... analysis, DDE but not PCB was linked with a lowered age of menarche ... the study included indirect measurement of the exposure and self reporting of menarche ...
Puberty - Physical Changes in Girls - Menstruation and Fertility
... The first menstrual bleeding is referred to as menarche, and typically occurs about two years after thelarche ... The average age of menarche is 12.5 in the United States ... In Canada, the average age of menarche is 12.72, and in the United Kingdom it is 12.9 ...