@Pippinwhite -- I have it too. It's often hereditary. My mom has it as well.
Probably 20 years ago, I had a small, pea-sized lump raise up on my breast and it scared me to death. My mom called a friend who is a nurse and she advised me to cut out my caffeine for two weeks and keep an eye on the lump and see if two weeks without caffeine made any difference. I cut the caffeine and in a couple of days, the lump was smaller. It was gone by the end of the week. Thrilled? Oh, yeah.
I know when I'm drinking too much coffee because that lump will pop right back up again.