Sore breasts- NOT pregnant

I have had a sore breast, now the other is sore as well.  I had a partial hysterectomy over 10 years ago so it is NOT pregnancy.  However, I still have my ovaries and cervix and ovulate but I have never experienced this before!  My left breast hurts, just aches!  Do women experience hormonal changes in their late 30's that could account for this?  At any rate, I have my next gyn exam next week if all else fails...

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