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Answers:

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I don't know; maybe hormones?

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There are a lot of hormones going through your body at the time which can rationale your breasts to become sore. Source(s): Happens to me too.

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Usually that's what happens to me. It gives you a sign when your period almost to starts or it's about to end.

-Good luck(:
: Azngurl K

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its all to do with the fluctuating hormones. Doc can prescribe meds such as mefanamic acid which can be relatively helpful.

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It's nothing to worry about, every girls breasts become sore and tender during the menstrual cycle. Completely average :)

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