Pain which is due to cold, should subside by heating locally.
If it doesn't,it is something more than that.
Do you have pain/difficulty in lifting shoulder, moving neck in all or any specific directions?
When the pain increases/decreases?
Do you feel like 'current in arm'?
Is it just pain or tingling or numbness?
Next Steps
Take initially pain killer, muscle relaxants, local heating and local gel/ointment for about 5-7 days. But, if no relief, we have to find cause. You need correct diagnosis. Further treatment depends upon that. You can consult us.
Health Tips
If the pain or neck spasm increases, show to doctor immediately. Tingling or numbness in Arm wiill be bad sign