A neck X-ray will rarely show the subtle neck injury from a concussion. It is more like a bruise of the connective tissue and such that causes inflammation that disrupts blood flow and causes neck muscle spasms. But it can lead to headaches and other struggles.

The only way many of us resolve subtle neck injuries is by treating our necks as injured. Icing, good posture during sleep and resting, avoiding neck straining efforts, and being disciplined with neck behaviors for weeks or more can show results.

Doctors are rarely any help. There is little they can do. Even most chiros are too aggressive. Some gentle physical therapy with gentle traction and light mobilization can help start the process.