Menstruation

Jerilynn C. Prior, Christine L. Hitchcock
In: The Corsini Encyclopedia of Psychology · 2010 · pp. 1–2 · doi:10.1002/9780470479216.corpsy0538 · W4229507239
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⚙ AI-generated summary by claude@2026-06, 2026-06-08 ⓘ

Menstruation is the monthly shedding of the uterine lining when pregnancy does not occur, with normal cycles lasting 21-36 days and bleeding for 3-5 days.

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Abstract

Abstract 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)

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