What is amenorrhea? Amenorrhea is the absence of a menstrual
period. Amenorrhea is sometimes categorized as: - Primary
amenorrhea. This describes a young woman who has not had a
period by age 16. - Secondary amenorrhea. This occurs when a
woman who once had regular periods experiences an absence of
more than three cycles. Secondary amenorrhea includes pregnancy.
Having regular periods is an important sign of overall health.
Missing a period, when not caused by pregnancy, breastfeeding,
or menopause, is generally a sign of another health problem. If
you miss your period, talk to your health care provider about
possible causes, including pregnancy.