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Published 19:00 8 Jun 2013 BST
Updated 07:41 18 Dec 2014 GMT
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Ahhh, so that's what's happening inside us?
The sore lower back, the agonising cramps, the hot and bothered feeling, the heat, the discomfort... it's because there's a WAR going on inside us.
Isn't science just great?
Pic via themetapicture.com
‘I’m a 29-year-old woman and my income would shock my friends if it was made public’
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