Hi, I ll try my best to explain. I ve had a dull pain (soreness) behind my right breast towards the top of my breast. I dont believe it s in my breast, but when I put pressure there with my fingers I can feel the soreness and it feels like it s behind my breast. When I sleep on my side it s very uncomfortable. I do have a lot of stress , but i m concerned this could be something much worse (although i have no other symptoms). I do have Hashimotos disease, and i m not sure if that has anything to do with it. I m just wondering what this could be, and how to go about testing for possible answers. It almost felt like a soreness from working out that never went away. Thanks, Nicole