Neck.pain shoulder pain scaping and cracking and popping when i turn my head plus been having painless.muscle twitching in legs when at rest?

Neck pain: The crackling and popping in the neck are the facet joints in the cervical spine that are akin to cracking your knuckles. That is not a concern. What is a concern is the neck and shoulder pain associated with twitching or cramping in the legs. This may be a sign of pressure on the spinal cord from a disc. An MRI of the cervical spine and an evaluation with a neurosurgeon would be a good decision.