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    Abnormal uterine bleeding (AUB) is irregular vaginal bleeding that is not caused by a serious medical condition.

    Normally one of your ovaries releases an egg during your menstrual cycle. This is called ovulation. Most women who have abnormal uterine bleeding get it when their ovaries don't release an egg. This can be caused by abnormal hormone changes. When your hormone levels are out of balance, they can affect the lining in your uterus, causing bleeding. Abnormal uterine bleeding is common before age 20 and after age 40.

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    Some women have abnormal uterine bleeding even though they ovulate. Experts don't fully understand this type of vaginal bleeding. It may be caused by changes in certain body chemicals.

      This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

      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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