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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.

always.com/en-us/tips-and-advice/your-first-period/10-common-period-questions

Period questions are so normal – you're not alone! Here are answers to some of the most frequently asked questions.

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.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.

rubycup.com/all-about-your-period/girls-first-period

Just started your period? No worries! We give you the answers to your questions and explain your first period in one simple page.

kidshealth.org/en/kids/five-period.html

Girls have lots of questions about periods. Here are five good ones - and the all- important answers!

www.webmd.com/women/guide/normal-period

Jul 15, 2017 ... Periods can be long and short, heavy and light. And it's all considered normal.

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

Girls usually start having menstrual periods between the ages of 11 and 14. Women usually start to have fewer periods between ages 39 and 51. Women in their ...

www.girlshealth.gov/body/period

Confused about your menstrual cycle? Learn about menstruation, what causes your period, menstrual blood, the average menstrual cycle, first periods, and more.