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  1. Jerilynn C. Prior,
  2. Christine Hitchcock

Published Online: 30 JAN 2010

DOI: 10.1002/9780470479216.corpsy0538

Corsini Encyclopedia of Psychology

Corsini Encyclopedia of Psychology

How to Cite

Prior, J. C. and Hitchcock, C. 2010. Menstruation. Corsini Encyclopedia of Psychology. 1–2.

Author Information

  1. University of British Columbia, Canada

Publication History

  1. Published Online: 30 JAN 2010


Menstruation refers to normal vaginal bleeding that is usually monthly. The endometrium (uterus lining) sheds when a woman is not pregnant. The menstrual cycle refers to the time from the menstrual flow until the day before the next bleeding (commonly called a “period”) begins, with normal lengths of 21–36 days (van Hooff et al., 1998). Normal flow lasts for 3–5 days, and the total amount of fluid is about 20–40 mL (4–8 soaked regular tampons or menstrual pads). (Hallberg, Hogdahl, Nillson, & Rybo, 1966)


  • estrogen;
  • progesterone;
  • ovulation;
  • menstrual cycle;
  • molimina;
  • perimenopause