I have had constant pain in my left bicep primarily, but sometimes shooting pain down to my wrist, sometimes in my shoulder. this has been going on 3 months. i have seen doctors, had xrays (no mri), am in physical therapy. no pain medication has brought

AN : An infection is unlikley to linger for three months untreated unless it were a slow growing process such as a fungal or atypical bacterium. These however are rare and it would be unusual to had an isolated infection of this type in the shoulder. There may be more than one issue. A primary problem rested to the impingement that was diagnosed and referred pain form elsewhere. The neck may give referred pain to the shoulder as can believe it or not abdominal or gastrointestinal issues such as the gallbladder. Referred pain is not usually mechanical i.e. It downs not worsen with shoulder movement. But it is possible to have both things going on at once. Finally the way in which pain is tolerated or not by different people is...Different if things don't seem right...Talk to your current treating physician for this problem if you think you may need to follow up earlier that you both had planned.

Evaluate Neck: If you are not improving have your doctor order a cervical spine mri. Many times a herniated disc in the neck can cause arm pain especially if you have not improved with the medications and physical therapy. If it is a herniated disc you may need evaluation from a spine specialist to determine what other options might be needed (injections, surgery, etc) to help reduce pain.