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When a girl starts her period, it means she has reached the age of sexual maturity that means she is old enough to get pregnant. When a girl is old enough to get pregnant, the uderin wall strengthens to protect the womb. But if no sperm is injected in it (if you don't have sex), then there is no need for the uderin wall to strengthen, so the extra blood cells that it built up are bled out of the vagina. That is your period. It usually does this about once a month.

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Q: What causes girls to start their period?
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Related questions

Can girls still grow after they start their period?

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When do girls have start there period?

Most girls will have their first period between the ages of 11 and 14. But some girls will start as early as 8, whilst others may be as late as 17.


What age do girls start to get there period?

girls are all different. We are all unique. But it is at the age of 12 to 14 is an average age to start their first period. good luck


What causes pink urine?

Any number of causes. Food and the start of a period.


What is the average age for girls periods to start?

the average age for a girls period 2 start is 11-16 but you can start your period at any time in your life but if you haven't started it by the time you are 18 go and see a doctor.


When should a girl start there period?

Girls usually get their first period between the ages of 11-15.


What causes your period to change and feel sick?

Some girls dont even feel sick when they have their period but some girls do. If you just started your period it's probably because you are still getting used to the changes.


How old do you have to be to start ur period?

There is not a certain age for girls to start their period. This can happen any time during puberty from the ages of 12 to 16.


Why did you start your period early?

All girls are different. Some start puberty earlier than others.


Is it ok if you have start your perido when you were 9?

Yes it's fine to start your period when you were nine because usually girls start their periods at age 8 to age 12. Yes it's fine to start your period when you were nine because usually girls start their periods at age 8 to age 12.


When will you get your period if you have all of the signs?

well lots of girls start at dif. ages 10,11,12,13,14,15 but the ages that are between 9-16 for a girl to start her periodfor a better age-range ask your mom how old she was when she got her period :) LOTS OF GIRLS GET THEIR PERIOD AT 12.5 BUT NOT ALL :)


You are 11 when will you start your period?

There's no rule. Some start at 11 and some girls start at 15. everyone's body is different.