Writers understand pain. They live with piercing stabs from rejection, dull aches from embedded insecurity, and throbbing neck pain caused by long hours at the writing desk.
Most cases of neck pain in writers are caused or worsened by poor posture while writing. Most of us, nowadays, write on a computer. We sit staring at either a laptop screen (possibly balanced delicately on our laps) or at a computer on a desk. Either arrangement is usually a clue to why you experience neck pain while writing.