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    Endometriosis - Cause

    The exact cause of endometriosis is not known. Possible causes include the following:

    • Your immune system may not be getting rid of endometrial cells outside of the uterus like it should.
    • Heavy bleeding or an abnormal structure of the uterus, cervix, or vagina causes too many endometrial cells to go up through the fallopian tubes camera.gif and then into the belly. (This is called retrograde menstruation).
    • Blood or lymph fluid may carry endometrial cells to other parts of the body. Or the cells may be moved during a surgery, such as an episiotomy or a cesarean delivery.
    • Cells in the belly and pelvis may change into endometrial cells.
    • Endometrial cells may have formed outside the uterus when you were a fetus.
    • It may be passed down through families.

    WebMD Medical Reference from Healthwise

    Last Updated: March 12, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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