Merck Manual

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Introduction to Menstrual Abnormalities

By

JoAnn V. Pinkerton

, MD, University of Virginia Health System

Last full review/revision Dec 2020| Content last modified Sep 2022
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Menstrual abnormalities include

Irregular or absent menses and nonmenstrual vaginal bleeding have many causes, but in women of reproductive age, pregnancy should always be suspected.

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