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Acute shortening of my menstrual cycle



Why would my menstral cycle shorten to 21 days or less without a gradual change to this end?


Normal menstrual cycles are 21-35 days. Shorter cycles can happen, especially in adolescents and perimenopausal women, but should be discussed with your physician.

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Response by:

Cynthia B Evans, MD Cynthia B Evans, MD
Clinical Associate Professor of Obstetrics & Gynecology
College of Medicine
The Ohio State University