Thank you for your answer. As a matter of fact the question I asked was actually for my husband. In January he had surgery for coon cancer and part of his intestines were removed, so this very well could be a cause although the upper back pain didn't start until a couple of months later.
I don´t think that is possible, it would be from other nerves or depending on were it is, it could also be from intestines. I hope you get better soon or talk to a doctor if you are not better.