Fibroids are large growths some women have in their womb. They are not the same as cancer. Fibroids may sometimes stop a fertilized egg from growing in the womb.

Doctors don't know why fibroids happen. They may be caused by changes in levels of hormones.

For more information, see our articles on Fibroids.

This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment. ©BMJ Publishing Group Limited 2008. All rights reserved.