Brachial Neuritis ?
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In April of 2003 I began to experience pain in both biceps and triceps. A few months later the pain also began in my shoulder's. My doctor's believed at that time that my pain was originating from my cervical injury's, afterall those are the symptoms. So instead of sending me for testing they just kept increasing my medication's. The pain just kept getting worse and the med's were not working any longer. What happened next was both of my shoulder's froze. This is medically known as adhesive capsulitis. Finally the doctor's new something else was wrong and sent me for mri's of bilateral shoulder's. I couldn't believe what the reports were stating. I had SLAP injury's in both shoulder's, tendonitis of the rotator cuff, arthritis, both muscle and marrow edema, and a mass in both spinoglenoid notch's. The report also stated that I may have possible brachial neuritis. and suggested more testing. A few other finding's but I don't remember them all. I then had to see an orthopedic surgeon.
I am only suggesting to you that it may also be possible that you may have another injury besides cervical. I cannot figure out how this damage has happened to my shoulder's. I had a lumbar fusion in June 2003, and haven't be able to do much of anything since then. But after reading your post your pain sounds identical to mine. I do wish you the very best.
Jeanne