In adults, the most common cause of a brachial plexus injury is high speed impact. This occurs with car accidents, motorcycle accidents, snowmobiles, downhill skiing, or any high-impact sport. The brachial plexus is most commonly injured with a trauma that pulls the shoulder away from the head. This can occur most commonly during motorcycle accidents when somebody's thrown from the motorcycle landing on the shoulder, pulling in a downward fashion. Football injuries, downhill skiing, or even difficult childbirth, sometimes delivering a large child can result in more pulling of the head away from the shoulder during that process, which can also damage these nerves.
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