A stiff neck that will not settle

WHEN STIFFNESS PERSISTS

Most stiff necks resolve within two weeks without anyone identifying what they were. The ones that do not are a different problem, and waiting longer is not the treatment for them.

What ordinary stiffness is

A neck that seizes after an awkward night or a long drive is usually doing something protective. A segment gets irritated, the surrounding muscle splints it to limit movement, and the splinting itself becomes most of what you feel. That is why the stiffness is often worse than the original injury and why it eases as soon as the guarding lets go.

Guidelines across Europe and North America converge on the same early management for this, and it is unglamorous: keep moving within tolerance, do not immobilize it, and expect improvement over days to a couple of weeks.

Why one side

Almost all of these are one-sided, and people read that as significant. Usually it is not. The facet joints are paired, the muscles that guard are segmental, and a single irritated joint produces a single stiff side with rotation limited toward it.

What does matter is whether the limitation is in one direction or all of them, and whether it is easing. A neck that loses rotation progressively over weeks, in every direction, is not behaving like a strain.

The six-week line

There is nothing magic about six weeks except that it is roughly the point at which continuing to wait stops being conservative and starts being a decision. By then the tissue has done what healing it is going to do largely unaided, and what remains is either a structure that is still generating pain or a nervous system that has learned the pattern.

Both are treatable. Neither improves by waiting longer, and the second gets harder the longer it runs.

What makes a stiff neck not a stiff neck

These are the features that change the question rather than the answer:

• Pain that travels below the elbow, with numbness or weakness in a pattern. That is a nerve root until proven otherwise — cervical radiculopathy.
• Clumsy hands, buttons, a changed gait, or heaviness in the legs. Cervical cord signs are not an outpatient wait. The findings that need urgent assessment.
• Fever, a neck that resists passive flexion, or profound malaise. Different differential entirely, and urgent.
• New headache with scalp tenderness or jaw claudication over fifty — temporal arteritis, which is a same-day problem because of the visual risk.
• A neck that will not straighten and pulls the head to one side over weeks rather than hours. Cervical dystonia is uncommon and frequently mistaken for spasm.

What is actually keeping it going

When a stiff neck does not settle, three things are usually running at once. There is a structure still generating input — most often a facet joint, sometimes a disc. There is a sensitized dorsal horn that has been receiving that input for long enough to amplify it. And there is a loading pattern that has not changed since the day it started, because the desk, the commute and the job did not change.

Treating only the first gives a good result that lasts six weeks. Treating only the third is the advice people have already had and could not follow. It is the combination that holds, and that is the argument for identifying the structure rather than continuing to guess at it.

How the structure gets identified

Not by a scan. Degenerative findings are near universal past middle age and correlate poorly with which segment hurts, which is why a normal MRI settles nothing and an abnormal one settles less than people assume.

It gets identified by examination and, where the pattern fits, by anesthetizing a specific joint’s nerve supply and seeing what happens to the pain. What a diagnostic block proves.

A neck that locked overnight is a different problem with a much better outlook. That one usually loosens inside three weeks.