The back of my neck constantly feels painful and has a burning sensation. What could this be?

Neck pain. Constant discomfort with burning sensation in the back of the neck is often caused by chronic tension in neck muscles from stress. They can also be strained or stressed from poor posture while working at a desk or computer or improper pillows . Other possibilities include exposure to wind and drafts, or arthritis of the vertebrae, or old whiplash injury. See your physician for evaluation as neede.