why do some women start menstruation late?
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why do some women start menstruation late?
A girl who has not had her first period by age 15 has what is called primary amenorrhea. This is different from infrequent or light menstrual cycles, which are very common in teen girls, particularly in the first couple of years after menstruation begins.
Primary amenorrhea refers to the absence of menstruation in someone who has not had a period by age 15. The most common causes of primary amenorrhea relate to hormone levels, although anatomical problems also can cause amenorrhea.