@docgus Hello and welcome! Yes, I am a mentor on Connect and I’ve been around here awhile. You may not need to go through nerve testing to diagnose thoracic outlet syndrome. There is also a vascular form of it. A doctor can listen to your pulse in your neck and when you turn your head, the pulse diminishes is you have a positive response. Physical Therapy helps and the best ones for this can also do myofascial release to loosen tight fascia. A neurologist can diagnose this or a vascular surgeon. There are also Doppler ultrasound tests while you raise your arms in different positions. Posture is very important and stretches to the front of the chest on a foam roller help. In case you have another type of restriction of vascular, your doctor should try to eliminate possibilities like blood clots that can cause swelling. A Doppler scan is used for that too.