So what are the symptoms of brachial plexus injuries?

Pain and weakness: Brachial plexus injuries typically present with pain or weakness in the shoulder or arm on the affected side. It is a very complicated piece of anatomy, but by seeing what parts of the limb are affected (and possibly doing electrical testing) a neurologist can often narrow down the specific are of plexus involved.

Many: Weakness of the arm or hand, numbness, tingling, pain in the arm, burning sensation in the arm or hand, paralysis of the arm or hand, atrophy of the muscles of the arm or hand, and many others.