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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.
In some cases, the feeling of pins and needles in your left arm can be caused by an underlying problem like trauma or injury, diabetes, brachial neuralgia, a heart condition, multiple sclerosis or nerve damage. In these cases, treatment might require more drastic measures like chemotherapy, surgery or medication.