Neck pain is most often caused by an injury, tension, arthritis, or chronic misuse of the neck. But in rare cases neck stiffness may be a sign of bleeding or infection within or around the brain or spinal cord. A stiff neck may be a symptom of one of these serious conditions when it:
Many serious illnesses can cause a stiff neck. Prompt treatment may help prevent serious complications.
WebMD Medical Reference from Healthwise