Thank you for the article. After reading it and doing more research, breast pain/sensitivity is definitely a symptom of thyroid dysfunction, and having just had a thyroid lobectomy, it seems this is the latest issue I'll be dealing with. I'll be seeing my endocrinologist this week to get thyroid levels checked and possible meds. I am on an aromatase inhibitor as a BC survivor, and I'm sure my hormones are really whacked at this point in time. Oh the fun...not.