When you say “upper back”, I will assume this is the region between the shoulder blades you refer to.
You could have aggravated this degenerative disc or the primary condition could be isolated disc resorption (IDR-see website) which is generally present but not identified by many radiologists.
You also could have an undiagnosed herniated a disc in the thoracic spine. An MRI of this area would reveal this disorder.
If the C6-7 disc is causing this pain, an epidural steroid injection will both identify and treat this problem. See pain diary for further explanation.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.