I dont know im going to a rheumy who specialises in muscle disease - so maybe a biopsy. i have pain in thoracic back -mines a long story- maybe read my old posts but . i think its nerve damage of some sort. please dont worry too much i ended up being diagnosed as psychosomatic and lots of meds which didnt help- i ruined my life for 2 years - am a lot worse physically but better mentally - try keep off meds did me know good. people here are very helpfull - the undiagnosed do understand too - feel free to pm me when you have enough posts 10 i think mags