Whiplash
- Neck pain, stiffness and reduced movement
- Headaches that start at the base of the skull
- Shoulder or upper back pain, sometimes arm tingling
- Often worse a day or two after the crash
Injuries
Whiplash vs concussion
The same jolt that strains your neck can shake your brain. Whiplash and concussion share symptoms like headache and dizziness, so it is easy to miss one while treating the other.
The short answer
Whiplash is a soft tissue injury to the neck. A concussion is a mild traumatic brain injury that affects how your brain works. You can have either or both after the same collision, and you don't need to hit your head to be concussed. If you have confusion, memory gaps, light sensitivity or trouble concentrating on top of neck pain, ask a doctor to check for concussion.
At a glance
Concussion
- Headache, dizziness, nausea or feeling dazed
- Poor memory, slow thinking or trouble focusing
- Sensitivity to light or noise, sleep changes
- Mood changes such as irritability or low mood
| What differs | Whiplash | Concussion |
|---|---|---|
| Part of the body | Neck muscles, ligaments and joints | Brain function |
| Cause | Rapid back-and-forth movement of the neck | The brain moving inside the skull, with or without a blow to the head |
| Scans | X-rays and MRI are often normal | CT and MRI are usually normal |
| How it is diagnosed | Your history and a physical exam of the neck | Your history, symptom checklists and cognitive or balance tests |
| Evidence for a claim | Range of movement, pain records, physio notes | Cognitive complaints, family observations, neuropsychological testing |
| Urgency | See a doctor soon after the crash | Warning signs need emergency care |
Why the two get mixed up
Both injuries come from the same whipping motion in a collision, especially a rear-end crash. Neck injuries can cause headaches and dizziness on their own, so a doctor who sees neck pain and a headache may record whiplash and stop there. Meanwhile, concussion symptoms like brain fog, irritability or struggling at work often show up days later, once the adrenaline wears off and you try to get back to normal life.
When you see a doctor, describe everything, including anything that seems minor: feeling dazed, not remembering the moment of impact, needing to reread emails, or finding screens uncomfortable. Those details are what point to a concussion.
Get emergency care straight away if you notice
A headache that keeps getting worse, repeated vomiting, a seizure, slurred speech, weakness or numbness in your arms or legs, one pupil larger than the other, growing confusion, or drowsiness where you can't be kept awake.
How each one plays out in an injury claim
Whiplash is one of the most common crash injuries, and insurers treat it with suspicion because it rarely shows up on scans. Early medical attention and steady physio records carry the claim. In England and Wales, whiplash from a road traffic accident lasting up to two years is valued using a fixed tariff under the Civil Liability Act 2018, and smaller claims usually go through the Official Injury Claim portal. See soft tissue injury claims.
Concussion is not covered by that whiplash tariff, so in England and Wales it is valued separately in the usual way. In the US and Canada, a documented brain injury can also affect no-fault thresholds. In Ontario, for example, the Minor Injury Guideline limits treatment funding for sprains, strains and whiplash-type injuries, and a concussion diagnosis can take you outside that limit. If symptoms last for months, doctors may diagnose post-concussion syndrome, and the claim then often needs evidence from a neurologist or neuropsychologist.
Example
A driver is rear-ended at a junction. The emergency department notes neck pain and sends him home. Over the next fortnight he struggles to follow meetings and gets headaches under office lights. His GP diagnoses a concussion as well as whiplash and refers him for assessment. Because his GP records when the symptoms began, the concussion becomes part of the claim instead of being written off as unrelated.
Common questions
Is whiplash a concussion?
No. Whiplash is an injury to the soft tissues of the neck, while a concussion is a brain injury. They often happen together because the same sudden movement causes both, which is why doctors should check for each.
Can you get a concussion without hitting your head?
Yes. A sharp acceleration and stop, like being rear-ended, can move the brain inside the skull enough to cause a concussion even if your head never touched anything.
How long do whiplash and concussion take to heal?
Many people improve from both within a few weeks. Some have symptoms for months. Recovery varies a lot between people, so your own doctor's follow-up notes matter more than any average.
Can whiplash cause dizziness and brain fog?
Neck injuries can cause dizziness and headaches, and pain and poor sleep can affect concentration. But ongoing memory or thinking problems should be assessed for concussion rather than assumed to be whiplash.
Last reviewed September 2026. General information, not legal advice.