Menstruation - Absent
Alternate Names : Amenorrhea, Lack of Menses, Missed Periods, Periods - Missed
Definition
The absence of menstrual flow, either primary (menstruation fails to begin before age 16) or secondary (menstruation begins at the appropriate age, but later ceases for 6 or more months in the absence of normal causes such as pregnancy, lactation, or menopause).
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