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en.wikipedia.org/wiki/Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina.

medlineplus.gov/menstruation.html

Menstruation (or period) happens monthly. As the uterus sheds its lining, vaginal bleeding follows. Menstrual blood is made of blood and tissue.

www.womenshealth.gov/a-z-topics/menstruation-and-menstrual-cycle

Feb 6, 2017 ... Menstruation is a woman's monthly bleeding. When you menstruate, your body sheds the lining of the uterus (womb). Learn how the menstrual ...

www.medicinenet.com/menstruation/article.htm

Learn about menstruation (menstrual cycle) of a woman. The approximate age a female begins menstruation, and conditions that may warn of irregular vaginal ...

www.webmd.com/women/tc/normal-menstrual-cycle-topic-overview

What is a menstrual cycle?The menstrual cycle is the series of changes a woman's body goes through to prepare for a possible pregnancy. About once a month, ...

kidshealth.org/en/teens/menstruation.html

Menstruation (a period) is a major stage of puberty in girls. It's one of the many physical signs that a girl is turning into a woman. Menstruation can be confusing,  ...

www.plannedparenthood.org/learn/health-and-wellness/menstruation

Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens once every month.

americanpregnancy.org/womens-health/menstruation

Menstruation is the discharge of blood and tissue from the lining of your uterus that occurs at the beginning of your menstrual cycle. Each woman's menstruation  ...

www.dictionary.com/browse/menstruation

Menstruation definition, the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in ...