What causes Erb’s palsy (brachial plexus injuries) in adults?

What causes Erb’s palsy (brachial plexus injuries) in adults?

Traffic accidents, most often those involving motorcycles, are the most common cause of brachial plexus injuries in teenagers and adults. Other causes of these injuries include gunshot or knife wounds, industrial accidents, accidents related to contact sports like football, surgical complications or tumors. These types of injuries are more likely to happen to men.