What can cause chronic neck pain, upper right side, c-1 or c-2?

A few possiblities. C1 or C2 (or both) could be 'stuck', causing pain.Several nerves in the region could be inflamed.Tiny muscles around vertebrae could be chronically contracted.Disc injury/herniation.Tears of suboccipital tendons.A good history & osteopathic hands-on exam can differentiate such causes.Manipulation may fix or may need prolotherapy for ligaments, neuroprolo for nerves, or studies to rule out disc inj.