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Do you use the computer a lot. Are you adopting bad posture at work, more of bending forwards. You could be having Cervical spondylosis
. You will need to get a neck Xray and Orthopaedic consult to be sure what it is. You can do mild extension exercises which is bending neck backwards to little. Avoid much forwards bending of neck. Take Paracetamol
for pain and relief from discomfort.