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There is one muscle under the chest that can force the first rib to compress on your nerves and blood vessels, creating your chronic pain.

That one muscle is the subclavius, which its located underneath the clavicle and attaches to the first rib. If this muscle becomes overused, then it can actually create compression by pulling the first ribs into the clavicle, which then compresses on the nerves and blood vessels.

This can create pain like thoracic outlet syndrome or even carpel tunnel syndrome. #short