Dizziness after Concussion

Concussion Dizziness and Road Risks

A large-scale Canadian study published in November 2025 has thrust post-concussion dizziness into sharper focus for reasons that extend well beyond the clinic. Adults diagnosed with concussion faced a 49 percent higher risk of subsequent motor-vehicle crash than matched patients with ankle sprains, with the danger peaking in the first four weeks when dizziness, delayed reactions and brain fog remain common.

Canada records an estimated 400,000 concussions each year, though the true figure is likely higher because many go unreported. The Canadian Concussion Centre at Toronto Western Hospital manages more than 1,200 patients annually from the roughly 30 percent whose symptoms fail to resolve within weeks; dizziness ranks among the most frequent and disabling, appearing in up to 80 percent of cases shortly after injury and often signaling extended recovery when it lingers.

The concrete stakes are sobering. In the Ontario cohort alone the excess crash risk generated 1,633 additional ambulance transports, nearly 60,000 extra hospital days and $835 million in societal costs. For affected individuals the symptom disrupts driving, return to work or school, and everyday balance; for the broader system it compounds the burden on a healthcare network already serving nearly two million Canadians living with long-term brain-injury effects.

Yet the mechanisms are more layered than classic vestibular explanations suggest. Emerging 2025 research shows dizziness often arises from visual-vestibular integration failures, autonomic nervous-system disruption during posture changes, and cervical-spine problems, with multiple subsystems impaired simultaneously in many patients weeks to months later. This multifactorial picture creates practical tensions: guidelines increasingly favour early sub-symptom-threshold exercise to speed recovery, yet dizziness demands cautious, targeted interventions such as vision therapy or cervicovestibular rehabilitation that are not uniformly available.