Persistent Post-Concussion Symptoms

What counts as "persistent" symptoms?

Most concussions resolve within two to four weeks. When symptoms continue beyond this — whether it's headaches, dizziness, brain fog, fatigue, or sensitivity to light and noise — clinicians refer to it as persistent post-concussion symptoms (sometimes called post-concussion syndrome).

This affects a meaningful percentage of people who sustain concussions. Some estimates suggest 15–30% of patients experience symptoms lasting beyond the typical recovery window. It doesn't mean the injury was more severe. It usually means specific treatable factors are preventing recovery from completing.

Why some concussions take longer to resolve

Persistent symptoms are rarely about ongoing brain damage. They're almost always about identifiable, addressable dysfunctions that haven't been properly evaluated or treated. The most common contributing factors include:

• Undiagnosed vestibular dysfunction — the inner ear and vestibular pathways were disrupted but never assessed, so the brain hasn't received the input it needs to recalibrate
• Cervical spine involvement — neck dysfunction driving headaches, dizziness, and visual symptoms that are mistakenly attributed entirely to the concussion
• Oculomotor dysfunction — impaired eye tracking or convergence that makes visual tasks exhausting and triggers headaches
• Autonomic dysregulation — the body's inability to regulate heart rate and blood flow during exertion, limiting exercise tolerance
• Sleep disruption — poor sleep quality interfering with recovery and amplifying every other symptom
• Prolonged rest — well-intentioned but often counterproductive. Extended inactivity deconditions the body and can perpetuate symptoms
• Anxiety and avoidance — understandable worry about symptoms can lead to hypervigilance and avoidance behaviours that reinforce the symptom cycle

The problem with "wait and see"

The most common advice people with persistent symptoms receive is to rest more and wait longer. For patients who've already been resting for weeks or months, this is frustrating — and the evidence no longer supports it.

Current research clearly shows that active, targeted rehabilitation leads to better outcomes than prolonged rest for persistent post-concussion symptoms. The key word is "targeted" — not generic exercise, but specific interventions matched to the identified dysfunctions.

How we approach persistent symptoms

Patients with persistent symptoms often need the most thorough assessment. By the time they reach us, many have already tried rest, medication, or general physiotherapy without meaningful improvement. The difference is specificity.

Our comprehensive assessment evaluates every system that could be contributing:

• Vestibular function — inner ear integrity, central vestibular processing, and visual-vestibular interaction
• Cervical spine — upper neck joints, muscles, and proprioception
• Oculomotor function — eye tracking, convergence, saccades, and smooth pursuit
• Exertion tolerance — heart rate response and symptom threshold during controlled activity
• Cognitive load tolerance — identifying the point at which mental tasks trigger symptoms

Treatment then targets the specific systems involved. For most patients with persistent symptoms, multiple systems are contributing — and addressing them in combination is what breaks the cycle.

It's not too late to get better

One of the most important things to understand about persistent symptoms is that duration does not determine prognosis. Patients who've had symptoms for months can still make meaningful, sometimes dramatic improvement once the right treatment begins.

If you've been told there's nothing more to do, or if you're simply tired of waiting for symptoms to resolve on their own — an assessment that looks at the whole picture may change your trajectory.