THe literature published by our local Breast Clinic (Wende Logan Young Clinic- best in upstate NY) asks women to not have any caffeine for 1(-2?) weeks before a mamagram because it will harden or enlarge breast lumps (?) - I can't remember the exact relationship, sorry, but there is some relationship there. THe literature doesn't say that caffeine is responsible for causing a lump to occur only that it will have an affect on the breat. Wish I could recall the info exactly but this is the best I can do for now.