In the U.S. the incident rate of secondary amenorrhea, caused by something other than pregnancy, is approximately four percent. Secondary amenorrhea, when your menstrual period stops for a period of six months or more, is more common than primary amenorrhea, which is if you've never had a menstrual period. You are more likely to have secondary amenorrhea if you have a body fat percentage under 17 percent.
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Amenorrhea
Amenorrhea is characterized by a complete lack of menstrual cycles. This may appear as primary amenorrhea, which is the lack of menstruation before age 16. Secondary amenorrhea occurs in women who have had normal menstrual cycles ...
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