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en.wikipedia.org/wiki/Menstruation

Menstruation, also known as a period or monthly, is the regular discharge of blood and .... Dysmenorrhea, or severe uterine pain, is particularly common for young females (one study found that 67.2% of girls aged 13–19 have it).

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

Period questions come into every girls mind! Puberty can be pretty crazy — you shouldn't have to worry about your first period on top of it all. Here are some ...

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

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

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

We have answers for girls and ideas for mothers. Don't be afraid of talking about periods, sharing information and advice is the best way to understand your ...

www.medicalnewstoday.com/articles/154699.php

Dec 12, 2016 ... A girl's periods generally begin between 8 to 16 years of age. On average, they start when a girl is about 12. Menstruation is a major stage in a ...

www.girlshealth.gov/body/period

Some girls find getting their periods very exciting, and others feel uncomfortable about it. It definitely can take a little getting used to! But lots of women come to ...

teens.webmd.com/girls/all-about-menstruation

Apr 24, 2017 ... Ever wonder what really happens during menstruation, when a girl enters puberty and has her period? Maybe you've wanted to talk to your ...

patient.info/health/periods-and-some-period-problems

May 2, 2016 ... Starting to have periods is part of growing up for girls. Periods usually start to occur around the same time as other changes happen to the body ...

youngwomenshealth.org/2011/05/25/male-pubertal-changes

May 25, 2011 ... The short answer is: Girls get periods because they have a uterus (womb). Guys don't have periods because they have don't have a uterus.