It is a bone spur that appears in the neck. When a bone spur
develops in your neck it may cause stiffness and pain in the back
and neck. It can protrude inward, occasionally making it difficult
to swallow or painful to breathe. The bone spur can also push
against veins, restricting blood flow to your brain.
Bone spurs in your neck is usually caused by osteoarthritis.
When the discs between your vertebrae start getting thinner your
body may try to compensate by adding bone tissue at the edges of
the vertebrae to try and compensate. This bone growth is known as a
bone spur.