Numbness is often a symptom of nerve involvement. For instance, numbness in the arm may be related to nerve irritation in the neck. In such a situation, turning or bending the head to the involved side may increase the symptoms. For example, a pinched nerve on the right side of the neck may cause numbness in the arm and hand when a person attempts to look back over the right shoulder. If nerve irritation becomes more severe, the arm and hand may become weak.
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