The abnormal cessation of
menstruation. Amenorrhea is
conventionally divided into primary and secondary
amenorrhea. With primary
amenorrhea, menstruation never takes place. It fails to
occur at puberty.
With secondary amenorrhea, menstruation starts but then
stops. The absence
of
menstruation during pregnancy is a form of physiologic
amenorrhea,
physiologic
in the sense that it is completely normal and is not caused
by anything
pathologic. Amenorrhea during lactation is another type of
physiologic
amenorrhea. The word "amenorrhea" is compounded from three
Greek roots
"a-",
no + "men", month + "rhoia", flow = no monthly flow.
Amenorrhea is less
commonly called amenia.
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