Feminax
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Bayer Healthcare
About your periods
Having your periods is another sign that your body is changing as you go from being a girl to a young woman. In fact, it's a pretty major change as it means your ovaries have started producing eggs every month so you can now get pregnant and have a baby (though we're not suggesting you do that just yet).
Why do girls have periods?
Having a period - or menstruation - is your body's way of getting rid of the lining that builds up on the wall of your womb (uterus) every month. The reason the wall gets thicker is to cushion and nourish a fertilised egg as it develops into a baby. If the egg isn't fertilised, the extra lining isn't needed so it breaks down and passes out of your vagina.
Most girls start their periods in their early teens and have one a month right up until their late 40s or early 50s. But don't worry if you're different. These ages are just averages, and who wants to be average?! Some girls start their periods as young as 8 while others have to wait until they're 17, or even later.
Period Predictor
Use our Period Predictor to find out the likely start dates of your periods for the next 12 months
Did you know?