I haven't been officially diagnosed with TOS yet, but my GP is leaning that way. I've had a cervical X-ray and MRI that has come back normal, EMG test on my arms that showed no peripherial nerve damage and now I'm being sent for a MRI on my entire chest and shoulders. I have pain in my neck and shoulders. Left side is worse than the right. Hand whitening and reduce radial pulse on my left arm, when stuck straight out to the side. My biggest complaint is the pain in my chest, especially behind the pectoral muscle where it goes up toward the shoulder. Does anybody else have terrible chest pain with their TOS? Thanks for the help.