In many teenagers with primary amenorrhea, puberty is late. But there is no permanent problem.
How long secondary amenorrhea lasts depends on the cause.
Pregnancy will stop a woman's menstrual periods until after childbirth.
A woman who stops taking birth control pills may not have a period for three months to a year.
Emotional or physical stress may cause amenorrhea for as long as the stress remains.
Rapid weight loss or gain, medications and chronic illness can cause missed periods.
Amenorrhea is permanent after menopause begins or after hysterectomy.