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Hi Ana. Statistically speaking, this is most likely musculoskeletal in origin and may involve actual spasms in the muscles of the back and diaphragm region. Your extended computer work in an uncomfortable chair would be the most likely culprit if you have been well otherwise. That said, there are certain conditions of the chest that can cause mid to upper back pain that is quite severe. Some of these are serious conditions such as an aneurysm in the large artery of the chest, the aorta. For this reason, I would suggest that if you are currently in pain that you go into a local urgent care clinic and request at least a CXR if not a chest CT to rule this type of condition out. Either way, they can also get you on an appropriate analgesic to control your discomfort.
Yes, that would suggest involvement of the upper trapezius muscles that extend from the middle of the back up to the back of the head and over to the top of the shoulders. These muscles are frequently strained from poor posture and prolonged positioning with the head flexed forward (e.g. computer work). Treatment is conservative and includes rest, heat, motrin, muscle relaxers if needed and careful attention to posture and ergonomic forces (i.e. those involved in your workstation such as the height of the computer, the comfort and height of the chair, the keyboard, etc.). If you can, get a referral to a physical therapist. They can develop a home program for you of stretching and strengthening to treat your current pain and prevent future recurrences. They can also come out to your home and evaluate your workstation and make suggestions about making it more user-friendly. :-)