I recently helped a client who was experiencing terrible headaches lasting for days as well as pins and needles in her left arm. Her husband had to drive her to my clinic; she was in agony when she came to see me. This lady is a line worker on 12 hour shifts with 4 days on, 4 days off. She regularly had to perform the same actions with her arms over and over again. Her neck movement was very restricted and this led to the discomfort in the arm and unpleasant headaches.