Hello, I suffer from left arm pain which I was told might be caused by a pinched nerve or herniated disc C4, C5, C6. Pain started in May with numbness and tingling down my arm. Took an X-ray , don t see much. Planning to do an MRI. I believe this would be the best way to diagnose? Can this be caused by cycling as I was cycling 60 to 80 km a week? Certain positions are soothing contrary to others where I get a shooting pain down the arm, sort of like an electric shock. Moving my head fully forward relieves me of pain. Basically, the worst pain is when I move my head back and sort of tuck in my chin. Any recommendations? Thank you. Lucio