Brachial plexus palsy is weakness or paralysis in parts of the arm due to injury. Learn about the causes, symptoms, and treatment options for this condition today.

Upper-arm weakness (paresis) or paralysis indicates peripheral-nerve damage to the brachial plexus, a network of lower cervical and upper thoracic spinal nerves supplying the arm, forearm, and hand.

Injuries of the upper brachial plexus roots affect the muscles around the shoulder. Injuries of the lower roots affect the hand. Many injuries affect both upper and lower roots. Current treatments ...

Parsonage-Turner syndrome (PTS) is a condition that brings on sudden, severe pain in your shoulder and upper arm. Here’s what you need to know.

Other prominent nerves originate from the brachial plexus roots and trunk, including the dorsal scapular, suprascapular, and long thoracic nerves.