If your pain is in your mid/upper back (lung area), it could be pleursy. I had the problem with pain breathing in. I didn't get a lung x-ray but one doctor said I needed one the other day, she said there could be something wrong with my lungs where I smoked for so long, but my PCP didn't think it was necessary, so I'm not going to worry about it. I don't know if pleursy is concerning and needs treatment or not. I didn't get anything done so ??