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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.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.womenshealth.gov/menstrual-cycle

Nov 13, 2017 ... Regular menstrual periods in the years between puberty and menopause are usually a sign that your body is working normally. Irregular or ...

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.

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.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, ...

www.mayoclinic.org/healthy-lifestyle/womens-health/in-depth/menstrual-cycle/art-20047186

Tracking your menstrual cycles can help you understand what's normal for you, time ovulation and identify important changes — such as a missed period or ...

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 ...