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Causes

Ovulatory DUB (not associated with anovulation) is less common than anovulatory DUB, and the bleeding, though abnormally heavy, is usually regular.

Ovulatory DUB may be due to abnormalities in the 2-week luteal phase of menstruation that occurs just before bleeding begins. It can also result from an "atrophic endometrium" that can result from a high progesterone to estrogen ratio, which may occur in women who take progesterone-only contraceptives. A lack of cell-building estroge...Read the full article