iPad, tablets can cause neck pain—Harvard study: A deep ache in your neck, shoulder or arm. Burning or tingling of the arm or hand. Headaches. Limited neck movement or painful movement. Stiffness of the neck and shoulder muscles. Short bursts of excruciating pain in the arm, back or shoulders. Intense pain that lasts for two to three days. Or pain that starts gradually but worsens over time.

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