it could be letting you know that your bout to start your period because mine only hurt when im bout to start and they hurt maybe two weeks before I then start so that could be it I hope I've help.
well..not on my period...but how can my left boob be growing at 18boob pain
if you're on your period that's probably it.Why Do I have pain in left boob?
Well I've gone threw it but its normal
It mean that Your boobs are growing(getting bigger) HOORAY FOR U! LOL
I think its due to periodsDoes drinking milk make your boobs grow?