Endo and breast pain?

Does anyone else have constant breast tenderness/pain as a symptom of endo? I've had breast pain since i hit puberty and it's always there, only worsening a week before my period. It never goes away, just lightly squeezing my breasts is so unbearably painful!!! Right now i have a heating pad pressed to my chest and it's barely helping.

I want to know if it's related to endometriosis or if it's a separate thing. Thanks in advance.