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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.

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.

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.medicalnewstoday.com/articles/154699.php

Dec 12, 2016 ... A period, or menstruation, is the shedding of the endometrium - the lining of the uterus (womb). Menstruation is also known as menses. Menses ...

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 ...

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,  ...

kidshealth.org/en/kids/menstruation.html

Getting a period is a natural part of becoming a woman. Find out more in this article for kids.

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, ...

study.com/academy/lesson/what-is-menstruation-definition-cycle.html

Menstruation is a natural process that is part of a woman's reproductive health. To learn why it happens and how it fits into the menstrual cycle,...