It not all in your head!!
Stress does link to inflammation which we have previously seen has a role in BC.
I would agree that stress is a potential significant aggravating cause, but not more.
http://www.ncbi.nlm.nih.gov/sites/en..._uids=16781084
"Inflammation is frequently present in the visceral fat and vasculature in certain patients with cardiovascular disease (CVD) and/or adult onset Diabetes Mellitus Type II (NIDDM). An hypothesis is presented which argues that repeated acute or chronic psychologically stressful states may cause this inflammatory process."