Whiplash: why your neck and head still hurt months after the crash
It might have been a low-speed bump at a junction, or a car that did not stop in time on the highway. The X-ray in the emergency department was clear, someone said whiplash, and you went home with painkillers and possibly a soft collar. That was weeks ago, or months. The neck still aches, and now there are headaches at the back of the head that were not there before.
On Lebanon's roads this is a common story. WHO Lebanon counted 2,685 crashes and 3,190 injuries in 2025, and those are only the ones that reached official figures. Most of the people behind that injury number will never need surgery. A good share of them will spend months wondering why a crash their X-ray called fine still hurts.
This article explains what whiplash actually is, why the X-ray was clear, how often headaches and jaw pain follow, and what the evidence says about getting better.
After any crash, a neck that might be fractured or a head that might be injured comes first. Get urgent medical care if you have:
- Numbness, tingling or weakness in the arms or legs, difficulty walking, or any change in bladder or bowel control.
- Loss of consciousness, confusion, repeated vomiting, drowsiness, or a headache that keeps getting worse.
- Sudden severe neck pain or headache with dizziness, double vision, slurred speech or difficulty swallowing, even days after the crash. Rarely, an artery in the neck is injured, and this is how it shows.
Being 65 or older, or a high-speed or dangerous crash (a rollover, being thrown from the vehicle, a motorbike or pedestrian collision), also means imaging before anything else. Emergency doctors use rules like the Canadian C-spine rule to make that call. In the study that built it, the rule picked up all 151 clinically important neck injuries among 8,924 alert, stable patients. If you were checked and cleared, the rest of this article is about the next question: why it still hurts.
What whiplash actually is
Whiplash is not a diagnosis of a particular tissue. It describes a mechanism: the body is thrown forward or back, the head lags behind because of its weight, and the neck is bent and loaded faster than the muscles can react. It does not take a dramatic crash. Low-speed rear-end collisions produce it all the time.
The medical term for what follows is whiplash-associated disorders, graded by what is found: neck pain and stiffness alone; pain with restricted movement and tender points; pain with nerve signs such as numbness or weakness; and fracture or dislocation. Most people fall into the first two grades. Those are the grades an X-ray will call normal.
Why the X-ray was clear
An emergency X-ray of the neck has one job: to find a fracture or a dislocation, the injuries that cannot be missed. If yours was clear, that job was done, and it is genuinely good news.
But a clear X-ray is not the same as nothing having happened. Strained joints, ligaments and muscles do not show on an X-ray, and neither does how the neck moves. Even MRI rarely pins down the source of whiplash pain, because the joints most often involved look ordinary when they are still. That is why the next step after a clear film is usually not another film. It is an examination of how the neck behaves.
How long it lasts, honestly
Many people improve within the first weeks. But an international task force that reviewed the research concluded that about half of people with whiplash still report some neck symptoms a year after the injury. That figure covers everything from mild, occasional stiffness to daily pain, so it is not a prediction that half of people stay disabled. It is a reminder that six months of aching is neither unusual nor imaginary.
What predicted slower recovery is telling. Greater pain, more symptoms and more disability early on all did, and so did low mood, a coping style built around avoidance, and fear of moving the neck. Details of the collision itself, such as its direction or the type of headrest, rarely predicted anything. The size of the dent in the car tells you very little about the neck inside it.
Headaches after whiplash
Headache is one of the most common complaints after whiplash, and when it lasts, the top of the neck is a frequent source.
In a study of 100 consecutive patients with neck pain lasting more than three months after whiplash, 71 also had headaches. Using controlled nerve blocks, the researchers traced the headache to one specific joint, C2-3, just under the skull, in 27 of the 100, and in 53% of those whose headache was their main complaint. History and examination alone could not confirm it, although tenderness over that joint was more common in the people who turned out to have it.
This is the same region behind headaches that come from the neck without any accident. Dizziness travels with it often enough after whiplash that it gets its own article: can your neck make you dizzy?
And the jaw
The jaw is the part almost nobody checks after a crash. A systematic review found that the median reported rate of jaw (TMD) pain after whiplash was 23%, against 3% in people without a neck injury, and that standard jaw treatments such as exercises and splints tended to work less well in people who had both. The evidence is not settled. Some later studies that followed people forward in time found no clear rise in jaw pain, so the link is best described as plausible rather than proven.
What is well established is that the upper neck and the jaw feed the same pain relay in the brainstem, and that clenching tends to rise with stress, which a crash and its aftermath supply in quantity. When neck pain, jaw pain and headaches all arrive in the same months, the neck and the clenching are likely converging, and treating one without looking at the other tends to leave the job half done. If your jaw has clicked, ached or tired more since the crash, our guide to TMJ and jaw pain is a useful next read.
What helps, according to the evidence
Early on, the clearest finding is that moving beats resting. In a randomised trial of 97 people injured in car crashes, an active approach built on frequent neck rotation exercises was compared with rest, a soft collar and gradual self-mobilisation. The active approach did better on pain and sick leave, and three years later only the group treated actively and early had neck movement matching people who had never been injured. A collar for comfort in the first days is one thing. A collar as the treatment is not supported.
Later on, the picture is more humbling. A trial in The Lancet randomised 172 people whose whiplash had lasted from three months to five years to either 20 sessions of a comprehensive exercise programme or a single advice session with phone support. Pain was no different between the groups at 14 weeks, six months or a year.
My reading of that, as a clinician: more sessions of general exercise is not the answer for a neck that has been sore for months. Finding the specific source, whether that is the C2-3 joint, the jaw or both, and treating that is a better bet than another generic programme. That is a judgement, not a trial result, and it is why assessment comes before anything else.
Four things to do this week
- Keep it moving. Turn your head gently to each side, within comfort, several times a day. Unless a doctor gave you a collar for a specific reason, it does not need to stay on.
- Write down the timeline. The date of the crash, and when each symptom started: neck pain, headache, dizziness, jaw pain. A headache that began the week of the crash tells a different story from one that was there before it.
- Press the top of the neck. Find the two hollows just under the back of the skull and press firmly for ten seconds on each side. If that reproduces your familiar headache, note it. The Source Test adds two more checks.
- Open your mouth slowly in front of a mirror. Clicking, pain, or the jaw swinging to one side, especially if it is new since the crash, is worth mentioning at your next appointment.
If it has been more than six weeks, the X-ray was clear and the neck and head are not settling, the next step is an assessment of the upper neck and jaw rather than more waiting. That starts with one short call.
Not sure where your headache starts? The Headache Map shows four common patterns. Tap the ones you recognise and it tells you which of them point at the neck and jaw.
Frequently asked questions
This article is general information, not a diagnosis. After a crash, anything in the urgent list above needs emergency care, and a clear X-ray does not replace a medical review if new symptoms appear.
The X-ray was clear. The headaches were not.
If your neck and head have hurt since a crash, your imaging came back normal and you are still waiting for it to settle, that is worth one short call. We'll tell you honestly whether this is something we can help with, or who you should be seeing instead.
Getting headaches with it? See where yours starts on the Headache Map, or run the Source Test: three physical checks, about three minutes.