Secondary amenorrhea is defined as
A woman who previously menstruated can develop secondary amenorrhea.Which is defined as absence of menstruation for three normal menstrual cycles. A woman with regular cycles and a delay of menses of even a week may warrant assessment with a pregnancy test.It is reasonable to evaluate a woman who has fewer than nine cycles per year.Reference: Berek and Novak's gynecology; 14th edition; Chapter 30; Amenorrhea
Absence of menstruation for one normal menstrual cycle
Absence of menstruation for three normal menstrual cycles
Absence of menstruation for six normal menstrual cycle
Absence of menstruation for one year
Sexuality and intersexuality