What is amenorrhea?

Amenorrhea is absence of menstruation.
athletic a., stress a. Amenorrhea associated with intense exercise; may lead to reduced levels of estrogen and, ultimately, premature osteoporosis.
primary a. Failure of menstruation to begin by the age of 16 years.
secondary a. Cessation of menstruation for at least 3 months in a woman who has menstruated in the past.

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