I went to the doctor recently with a painful lump in my breast. I was kindof scared, but knew most cancerous lumps aren't painful. The doctor told me it was due to caffine. I usually drink coffee a couple times a day, chocolate (which has caffine in it), and soda. Apparently, this can have consequences on your breasts. I try to only limit my coffee to once per day and that has helped significantly. If I have more than one though, I notice the tenderness in my breasts. What he didn't explain to me was, is this realated in any way to cancer or can these lumps become cancerous. Has anyone else had this reaction to caffine?