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menstruation
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Diagram of the menstrual cycle showing hormone levels, follicle development, and endometrial changes across 28 days. It highlights menstruation, ovulation, and the follicular and luteal phases, with labeled curves for estrogen, progesterone, FSH, and LH.
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menstruation: References & Edit History

Article Contributors

Primary Contributors

  • Stanley George Clayton
    Professor of Obstetrics and Gynecology, King's College Hospital Medical School, University of London, 1967–76.
  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Modified link of Web site: National Center for Biotechnology Information - PubMed Central - Menstrual Cycle: Basic Biology. Sep 04, 2026
Add new Web site: NHS inform - Periods (menstruation). Jul 24, 2026
Add new Web site: NHS - Periods. Aug 15, 2025
Add new Web site: Frontiers - Frontiers in Reproductive Health - Editorial: Menstruation: Myths, mechanisms, models and malfunctions. Jul 03, 2025
Add new Web site: Healthdirect - Menstruation (periods). Jan 30, 2025
Add new Web site: National Institute of Child Health and Human Development - Menstruation and Menstrual Problems. Jul 15, 2024
Add new Web site: Planned Parenthood - Menstruation. Nov 17, 2023
Add new Web site: WebMD - All About Menstruation. Aug 22, 2023
Link added. Jul 14, 2023
Add new Web site: National Center for Biotechnology Information - PubMed Central - Menstrual Cycle: Basic Biology. May 25, 2023
Add new Web site: Cleveland Clinic - Menstrual Cycle. Jan 20, 2023
Add new Web site: Healthline - Menstruation: Facts, Statistics, and You. Dec 06, 2022
Article restructured. Jun 10, 2022
Add new Web site: Verywell Health - Everything to know about Menstruation. May 01, 2022
Add new Web site: Buzzle.com - Menstruation. Jan 16, 2014
Add new Web site: The Merck Manuals - Menstruation. Mar 20, 2013
Add new Web site: National Library of Medicine - Menstruation. Mar 20, 2013
Add new Web site: Mayo Clinic - Women's Health - Menstruation. Mar 20, 2013
Add new Web site: Drugs.com - Menstruation. Mar 20, 2013
Add new Web site: MedicineNet.com - What Is the Normal Cycle for Menstruation? Mar 20, 2013
Added new Web site: How Stuff Works - Healthguide - Menstrual Disorders In Depth. Sep 03, 2008
Added new Web site: How Stuff Works - Health - Herbal Remedies for Menstruation. Aug 07, 2008
Media added. Jul 10, 2008
Added new Web site: The Nemours Foundation - Teens Health - Irregular Periods. May 12, 2008
Added new Web site: The Nemours Foundation - For Teens - All About Menstruation. May 12, 2008
Added new Web site: The Nemours Foundation - Teens Health - Tampons, Pads, and Other Period Supplies. May 09, 2008
Article added to new online database. Oct 19, 1998
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