After a teen has been menstruating for a few years, her menstrual cycle typically becomes more regular. For most women, a normal menstrual cycle ranges from 21 to 35 days. However, up to 14% of women have irregular menstrual cycles or excessively heavy menstrual bleeding. Most abnormal uterine bleeding can be divided into anovulatory and ovulatory patterns.

  • Anovulatory: Irregular/infrequent periods with absent, minimal, or excessive bleeding.
  • Ovulatory: Periods that occur at regular intervals but are characterized by excessive bleeding or a duration of greater than 7 days.
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