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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.
8. A Brain Tumor Is a Rare Cause of a Numb Arm. Relax -- brain tumors are quite unusual. While it's important not to panic at the first sign of a numb arm, it could be caused, in some very rare cases, by a brain tumor. A brain tumor can cause loss of sensation and movement in an arm.