Whiplash pain that outlasts the injury usually comes from two sources at once. One is a nervous system that stays on high alert after the tissue heals. The other is a real source in the neck. Most often that is a cervical facet joint (a small joint at the back of the neck), found in 54% to 60% of people with chronic neck pain after whiplash.
Most people recover from a whiplash injury. A minority do not. The difference between those two groups was measured early, by following people forward. And it is not what most clinics look for.
Why do some people still have whiplash pain years later?
One study followed 65 of an original 76 freshly injured people out to two and three years after the crash. While the injury was still new, four factors were already predicting who would still be doing badly years later:
- higher pain and disability scores at the start,
- older age,
- cold hyperalgesia, meaning cold sets off pain it should not — a reading taken from the nervous system, not from the neck,
- moderate post-traumatic stress symptoms.
People with ongoing moderate or severe symptoms at two to three years still showed less range of motion. Their neck muscles fired in an altered way when they tucked their chin. They also had heightened sensitivity and more emotional distress. People who recovered, and those with mild symptoms, showed only lasting changes in how the neck muscles fired.
Half of that list belongs to a different specialty, and no needle reaches either item on it. That is the finding. A practice that checks only the joint is missing half of what decides the outcome.
What is central sensitization after whiplash?
Cold hyperalgesia is a sign of central sensitization. The pain-processing parts of the spinal cord and brain have turned up their volume. So the same signal from the body produces a bigger response. It is a real, physical, measurable state. It does not mean the pain is imagined.
It is also a state with inputs. Broken sleep, inflammation across the body, a body stuck in alarm mode, and unstable blood sugar all act on the same machinery. That is why the terrain argument is not a change of subject when the injury is a neck. In our view, the nervous system is the second environment. Both environments have to be tuned up before a trigger aimed at a structure can give a lasting result. The whole-body side is laid out in Metainflammation.
What causes chronic neck pain after whiplash?
None of the above means the pain has no source in the neck. In chronic neck pain after whiplash, the cervical facet joints are the most common source found. Comparative test blocks in 50 patients in a row found a painful joint in 54%. A later study used placebo-controlled blocks in 68 referred patients in a row. It put the overall rate at 60%. The second study exists because placebo response was the obvious objection to the first. The finding held up.
Imaging tends to mislead in both directions here. Pooled across 33 studies of people with no symptoms at all, disc wear climbed from about a third of twenty-year-olds to almost everyone at eighty. A finding that ordinary does not explain one person's pain. And it certainly does not date it.
Treating one environment while ignoring the other
This leads to two familiar failures, and both are common.
Treating the structure inside a sensitized system
A confirmed facet joint is treated. The pain improves, but for less time than expected, and the cycle repeats. Four procedures later, the conclusion is that the treatment does not work. What is really happening is this. A pain signal from the neck is being turned down in a system whose volume is set high. So the drop does not come through.
Treating the system while ignoring a real generator
The mirror image is the one that makes patients angry, with good reason. Someone with a truly painful joint capsule is sent to stress management and told that pain is complex. It is complex. It also has a source. In 54% to 60% of this group, that source can be found.
How is chronic whiplash pain treated?
Both, on purpose, in a stated order. First, find out if a source in the neck exists and at which level. Measure the sensitization and the whole-body load instead of guessing at them. Fix what can be fixed in the second environment while planning treatment of the first. Then treat the confirmed target with the tool the evidence supports for that target. Note that the graded regenerative evidence in the spine is mostly for the low back, not the neck. The neck record is thinner. Our specific neck position is in Cervical facet pain and regenerative approaches to the neck.
A neck that has hurt for three years is not a mystery. It is usually two problems, each treated as if the other did not exist.
Frequently Asked Questions
Why does my neck still hurt when the MRI is normal?
Because the parts that most often cause lasting pain after whiplash are joint capsules and an oversensitive nervous system. Neither one shows up on a standard scan. The same mismatch in other body areas is covered in Your Scan Came Back Clean and You Are Still in Pain.
What is cold hyperalgesia and why do you test for it?
It is an unusually painful response to cold. It is a sign that the nervous system, not just the neck, is turning up the signal. In the study that followed people forward, it predicted a poor outcome two to three years later. Why a nerve acting this way is usually a victim, not the source, is explained in Burning Nerve Pain: The Nerve Is the Victim, Not the Criminal.
Is an injection the answer for chronic neck pain after a collision?
Only into a target that has been confirmed. And only alongside work on the whole-body and nervous system side. Treating a joint inside an oversensitive system gives you the patient with four procedures and no lasting result. What the neck evidence supports is laid out in Cervical facet pain and regenerative approaches to the neck.
Does stress really change how much my neck hurts?
Post-traumatic stress symptoms were one of the four factors that predicted a poor outcome years later. That was in the group of injured people followed forward. So it is a medical factor, not a comment on character. How emotional and inflammatory load affect a pain system is covered in How to Break the Chronic Pain Cycle.
It has been three years. Is there anything left to do?
Yes. The first step is usually the one that was never done. That means finding which structure causes the pain and what state the nervous system is in. Long-term cases are the very group the testing and treatment evidence here was built on. The reasoning is in Why Standard Pain Management Failed You.
How is chronic whiplash pain diagnosed?
By testing both sources of pain, not just taking pictures. For the neck itself, test blocks show whether a facet joint is the pain source and at which level. Placebo-controlled blocks found a painful facet joint in 60% of referred patients. For the nervous system, signs such as cold hyperalgesia show that pain is being turned up. Sensitization and whole-body load are measured, not guessed.
Do most people recover from whiplash?
Yes, most people do. A minority do not. The early signs of who will struggle were measured in a group followed for two to three years. Higher pain and disability at the start, older age, pain set off by cold, and moderate post-traumatic stress symptoms all predicted a poor outcome. Half of those signs are not about the neck at all.
Can disc degeneration on my MRI explain my whiplash pain?
Usually not. Across 33 studies of people with no symptoms at all, disc wear went from about a third of twenty-year-olds to almost everyone at eighty. A finding that common cannot explain one person's pain. It cannot date the injury either. After whiplash, a painful facet joint and an oversensitive nervous system are the sources to look for.
Find out what your recovery is actually limited by
Regen.MD begins with a physician-led Clinical Evaluation — a review of your history, your imaging and your metabolic data, and a written terrain roadmap before any procedure is discussed. Evaluation is contingent upon review of your data.
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Sources
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- Manchikanti L, Navani R, Navani A, et al. Comprehensive evidence-based guidelines for regenerative therapies in the management of chronic low back pain: 2025 update from the American Society of Interventional Pain Physicians (ASIPP). Pain Physician, 2025. PubMed 41481869