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Puberty and menstruation are triggered by estrogen, of which high quantities are released by the Pituitary gland in the brain.
That's a bit like asking why it doesn't get dark until sunset.

Puberty is the name for the phase when the body is growing big/mature enough to be able to become a parent. And for girls/women, they can't become parents unless they're menstruating. So for girls/women puberty and menstruating are tied together.

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Loyce Kuhn

Lvl 13
3y ago

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