<s>[INST] today i was driving and i felt this popping senesation in the back of my head. After it popped it started to tingle and then it started to feel numb.It hurt to move my hand from the back of my head. i have dealt with this for a while now but today was different. It popped at least 10 times in an hour. each time was worse. what could be causing this? [/INST] Hello, I have studied your case. I think you might be having cervical spondylitis.  In this there is nerve compression in spine. It causes pain in whole shoulder. It can be confirmed with MRI of the shoulder. You should apply soft cervical collar.  Hot water fomentation and volition gel should be applied. Avoid using very high pillow.  Intermittent cervical traction is also helpful. Let me know if there is any other followup questions. Thanks </s>