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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.
Although some of the causes of arm tingling are not life threatening, the symptom could also indicate something serious like a Stroke or a Heart Attack. When arm tingling happens in the left arm, it may be a cause for immediate medical attention. If arm tingling comes with these symptoms, seek medical help immediately. 1  Coldness with profuse perspiration.  Weakness, overall or just of the affected arm with partial or complete loss of sensation in the arm.