A member asked:

Can thoracicos cause pain in the tricep in the back upper arm, if not, what nerve could cause this,and in specific what muscles does thoracicos affect?

A doctor has provided 1 answer
Dr. Edward Hellman answered

Specializes in Orthopedic Surgery

Yes: It depends in part on the cause of the TOS. You are describing the distribution of the c7 nerve, which can definitely be compressed in TOS, especially if your neck MRI is normal.

Answered 3/23/2015

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