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1 One of the most common causes of left arm (or right arm) pain and tingling comes from issues or injuries of the cervical (neck) spine or brachial plexus. 2  Older people often get this as their spines degenerate, discs loose their thickness and the vertebrae sag closer to each other.
However, sometimes pins and needles in left arm can be caused by something more severe and can become chronic. When this is the case, the tingling feeling can be accompanied by other symptoms such as numbness, pain and itching. This can be an indication of nerve damage caused by a wide range of ailments.