Amenorrhea is the absence of menstruation. Secondary amenorrhea occurs when you’ve had at least one menstrual period and you stop menstruating for three months or longer. ALSO READ: 5 Major Life-Threatening Diseases That Commonly Affect Women Secondary amenorrhea usually isn’t harmful to your health. Secondary amenorrhea is the absence of menstrual bleeding in a woman who had been menstruating but later stops menstruating...