Concussion After a Car Accident

Why car accidents cause concussion even without hitting your head

Most people assume a concussion requires a direct blow to the head. In a car accident, that's often not the case. The rapid acceleration and deceleration forces involved in a collision — even at low speeds — can cause the brain to move inside the skull, stretching and stressing the neural tissue in ways that produce a concussion.

This is why many MVA patients don't realize they have a concussion. There was no obvious head strike. The airbag didn't deploy. They walked away from the scene. But in the hours and days that follow, symptoms begin to emerge.

Symptoms to watch for after a motor vehicle accident

Post-concussion symptoms after an MVA often overlap with — and are sometimes masked by — the general shock and stress of the accident itself. Watch for:

• Headaches — particularly at the base of the skull, temples, or behind the eyes
• Neck pain and stiffness — whiplash and concussion frequently co-occur, and both require treatment
• Dizziness or feeling "off balance" — especially with head movement or in busy visual environments
• Brain fog and difficulty concentrating — trouble following conversations, reading, or staying on task
• Fatigue — feeling exhausted even after normal activity or a full night of sleep
• Light and noise sensitivity — bright screens, sunlight, or loud environments become difficult to tolerate
• Sleep disturbances — difficulty falling asleep, staying asleep, or feeling unrefreshed
• Irritability or mood changes — feeling more anxious, low, or emotionally reactive than usual

Symptoms may not appear immediately. Some patients feel fine in the first 24 hours, only to develop symptoms over the following days as the brain's inflammatory response sets in.

Why MVA concussions are often more complex

Concussions from motor vehicle accidents tend to be more complex than sports concussions for several reasons.

First, the forces involved are multi-directional. A collision can produce rotation, side-to-side, and front-to-back forces simultaneously — affecting multiple brain systems at once.

Second, whiplash almost always co-occurs. The same forces that affect the brain also affect the cervical spine, causing joint, muscle, and nerve injury in the neck. Cervicogenic symptoms — headache, dizziness, and neck pain originating from the spine — can compound and mimic concussion symptoms, making accurate diagnosis and targeted treatment essential.

Third, the psychological impact of a collision — anxiety, fear of driving, heightened stress response — can amplify symptom perception and slow recovery if not addressed alongside the physical injury.

The importance of early assessment

One of the most consistent findings in concussion research is that early, guided management leads to better outcomes than rest and watchful waiting. This is especially true for MVA concussions, where the combination of cervical injury and brain injury means that without proper assessment, it's easy to treat the wrong thing — or nothing at all.

A comprehensive concussion assessmentevaluates the vestibular system, cervical spine, oculomotor function, and cognitive status together, giving us a clear picture of exactly what's injured and what needs to be treated.

What treatment looks like for MVA concussion

Because MVA concussions typically involve both the brain and the cervical spine, treatment is rarely one-dimensional. Our approach addresses both simultaneously:

• Cervical spine manual therapy — joint mobilization and soft tissue treatment to address whiplash injury and cervicogenic headache
• Vestibular rehabilitation — gaze stabilization and balance retraining to address dizziness and spatial disorientation
• Visual-vestibular integration — retraining the coordination between your visual system and balance centres
• Graded activity and return-to-function planning — a structured progression back to driving, work, and daily activities at a pace your brain can tolerate
• Education and self-management — understanding your symptoms, pacing strategies, and what to avoid in the early stages

No referral is needed

You do not need a referral from your doctor or insurance company to begin concussion physiotherapy. You can book directly for an initial assessment. If you are going through an auto insurance claim (Accident Benefits), your treatment may be covered — your insurer can direct bill once a treatment plan is in place.

If you're unsure whether what you're experiencing is concussion-related, the best step is always assessment. We can help clarify what's going on and point you in the right direction — even if the answer turns out to be that a different specialist is more appropriate.