The brachial plexus is a network of nerves that runs through the shoulder, down the arm, and to the hand. When it becomes inflamed, an individual will experience brachial radiculitis—also known as brachial plexitis, brachial plexopathy, brachial plexus injury, brachial neuropathy, and Parsonage-Aldren-Turner Syndrome. Brachial radiculitis is characterized by sudden-onset pain—typically occurring at night—then subsequent weakness and numbness in the arm and shoulder. Most commonly, the condition occurs in men ages 20