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Amenorrhea is the prolonged absence of a menstrual period. Learn about amenorrhea, possible causes and how it can be treated.

Key points

  • Amenorrhea means a prolonged absence of a menstrual period.
  • Primary amenorrhea is when menstruation doesn’t start by age 15. Secondary amenorrhea is when menstruation has been happening regularly and then stops for more than three months.
  • Amenorrhea can happen for many reasons; sometimes it is normal but in other cases your teenager may need treatment for an underlying condition.
  • Treatment will depend on your teenager’s age and what is causing amenorrhea.
Last updated: May 3rd 2023