Spinal instability is a complex problem and many factors contribute to it. It can be the result of an injury, degenerative aging, or genetics. Many factors play into spinal instability, not just "weakness of the trunk."
physical therapy blog
Recent research reveals that there is a link between your immune system and pain. Whether you're recovering from an injury or an infection, or from some sort of distress, your immune system can recognize this and react.
With all of our technological devices (cell phones, tablets, smart-tv's, computer screens) these days, its no wonder that sitting with poor posture can lead to neck pain.