Dysfunctional Uterine Bleeding
Dysfunctional uterine bleeding (DUB) is irregular bleeding during a menstrual cycle that is caused by hormonal irregularities. The most common hormonal irregularity occurs because the ovary did not ovulate (the ovary did not produce an egg during that particular cycle). This is called an "anovulatory cycle." Anovulation is very common. Many women have one or two anovulatory cycles each year. Sometimes the anovulation will cause irregular bleeding. You may have bleeding between normal periods; bleeding can last from one period to the next, or for a prolonged period.
This video discusses the causes of dysfunctional uterine bleeding. To see the video, wait a few seconds for the black box to appear and then press the play button.
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