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What is menstruation?

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Menstruation is a woman's menstrual period. It usually starts in girls ages 12 to 13, but it can start earlier or later than that. The menstrual fluid that comes out during a period is a mixture of tissue that lines the uterus and blood. The menstrual cycle is about four weeks long, starting on the first day of bleeding and ending when the next period begins. But it can vary a lot, especially when a girl first starts her period.

From: All About Menstruation WebMD Medical Reference

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

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What does a menstrual period feel like?

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