I'm 19 years old and my period has been irregular since I first got it. I've had it for 5 years now. Is this normal?
– Clare*

It is normal to have irregular periods for the first few years of menstruating — and sometimes even longer. But the only way to know if everything's OK is to visit your doctor.

A number of things can cause irregular periods. A girl may have something going on with her hormones, for example. And excessive exercise, not eating enough, or being underweight or overweight can also affect a girl's menstrual cycle. So can medications or drugs (like steroids).

Since you've had irregular periods for more than 3 years, see your doctor to find out what's causing them. Your doc may be able to prescribe medications to help correct a medical problem. Or, if things like exercise or eating habits are behind your irregular periods, a doctor can recommend lifestyle changes.

Girls who are having sex (or have had sex in the past) should get a pelvic exam. Pregnancy or sexually transmitted diseases (STDs) can also affect a girl's periods — and some STDs can cause serious long-term complications, such as infertility.

For more information, read these articles:
All About Menstruation
Coping With Common Period Problems
Female Reproductive System
Breast and Pelvic Exams
About Sexually Transmitted Diseases (STDs)

Reviewed by: Larissa Hirsch, MD
Date reviewed: October 2008

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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.