I haven't had my period in a few months and I know I'm not pregnant. What's wrong with me?
– Alyssa*

It's not unusual, especially in the first couple of years after you've begun menstruating, to miss periods or to have an irregular menstrual cycle. Many girls also notice changes in the flow and duration of their periods from month to month.

Though irregular periods are common, it's always a good idea to talk to your doctor about it. Some medical problems (such as hormone imbalances) and other things (such as stress or too much exercise) also can cause girls to miss their periods. An evaluation by a doctor can help determine the cause of any possible problems.

For more information, check out these articles:
All About Menstruation
Coping With Common Period Problems
My Periods Are Irregular. Is Something Wrong With Me?

Reviewed by: Larissa Hirsch, MD
Date reviewed: September 2006

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Although we can't reply personally, you may see your question posted to this page in the future. If you're looking for medical advice, a diagnosis, or treatment, consult your doctor or other qualified medical professional. If this is an emergency, contact emergency services in your area.

*Names have been changed to protect user privacy.