Upper Back Pain More Condition_symptoms What Could Be Causing My Upper Back Pain?

What could be causing my upper back pain? - upper back pain more condition_symptoms

For a little more than a week, I had pain in my upper back along my spine between my shoulders and neck. They were getting worse and my muscles tighten. Sometimes it radiates to the neck and my arm is weak and sensitive. Ive also had headaches, which make me very badly. In the last month or so I lost weight without trying, and not able to eat much because it makes me sick. Both problems can be linked?