The menstrual cycle is the series of changes a woman's body goes through to prepare for a pregnancy. About once a month, the uterus grows a new lining (endometrium) to get ready for a fertilized egg. When there is no fertilized egg to start a pregnancy, the uterus sheds its lining. This is the monthly menstrual bleeding (also called menstrual period) that women have from their early teen years until menopause, around age 50.
| By | Healthwise Staff |
| Primary Medical Reviewer | Sarah Marshall, MD - Family Medicine |
| Specialist Medical Reviewer | Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology |
| Last Revised | March 22, 2011 |
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