![]() Repetitive arm and shoulder movements can irritate the brachial plexus nerves or cause swelling that constricts the space inside the thoracic outlet. Bony growths on the collar bone or first rib can press against the brachial plexus or subclavian blood vessels. Having an extra rib above the first rib can affect the structure of the subclavian artery. Hunching over or carrying excess weight in the abdominal region can compress the space between the collar bone and the rib cage, leaving less space for the nerves and blood vessels. Scar tissue may form when the muscle heals, which can put pressure on the nerves that run down the arm. Injuries that involve the neck, such as whiplash, can cause inflammation and tears in the neck muscles. The sections below will cover these possible causes in more detail.
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