I get random pain under my left breast on my rib cage off and on. I also have a pain upper left back between spine and shoulder blade. Related?

Possibly related. Hi Kkovac4 They could possibly be related. This sounds like what we call "radicular pain" meaning it could be originating from the thoracic nerve roots that come off the spinal cord. We see that sometimes with Shingles especially if you had a skin rash in the same location. I would check with your GP/Family doc. Best of luck! Dr. Ayman Omar.