A claimant may report headaches, dizziness, poor concentration, memory problems, fatigue, irritability, sleep disturbance or anxiety after an accident. Imaging may be normal, emergency records brief and loss of consciousness absent. The claimant may also appear well during examination.
The insurer may ask: if the injury was mild and the scan was normal, why are symptoms continuing months later? The question is understandable. It is also incomplete.
Normal imaging is not the end of the assessment.
A normal CT or MRI scan does not exclude mTBI. Conventional imaging is primarily intended to identify structural injury, bleeding, fracture or other acute complications. It does not detect every functional disturbance associated with concussion. Equally, normal imaging does not mean that every post-accident headache or memory complaint is caused by brain injury. The assessment must consider the mechanism, acute symptoms, contemporaneous records, recovery pattern and alternative explanations.
Was there a blow to the head or rapid acceleration and deceleration? Was there confusion, loss of consciousness or post-traumatic amnesia? Were symptoms reported early? Did the claimant return quickly to normal activity, or was difficulty documented? It should not be applied simply because symptoms followed an accident mTBI is a clinical diagnosis.
The first records matter.
Early records often carry weight because they show what was reported before the dispute developed. Ambulance notes, emergency department records, GP entries and occupational health records may document head impact, confusion, dizziness, vomiting, headache, visual disturbance or memory difficulty. Early and consistent reporting may support accident-related mTBI. Symptoms that are absent, delayed or inconsistent make causation more difficult.
Absence from a record is not conclusive. Clinical notes may be brief, and a patient may focus initially on pain or shock. Cognitive problems may become apparent only when the person returns to work, driving, screens or demanding daily tasks. Nevertheless, a complete absence of early head-injury symptoms requires explanation. A genuine problem reported months later may still exist, but the expert must decide whether mTBI is the probable cause or whether another explanation is more persuasive.
Symptoms overlap with other conditions.
The symptoms associated with mTBI are not unique. Headache, fatigue, poor concentration, irritability, poor sleep and memory complaints may also arise from pain, medication, anxiety, depression, post-traumatic stress, migraine, vestibular dysfunction or pre-existing health problems.
A claimant with whiplash pain may sleep badly and struggle to concentrate. Depression may reduce memory and motivation. Pain medication may cause mental slowing. These possibilities do not exclude mTBI, but they show why careful differential diagnosis is essential. The expert must avoid two extremes: dismissing symptoms because imaging is normal and attributing every post-accident symptom to brain injury.
A balanced opinion asks whether symptoms are clinically consistent with mTBI, appeared within a plausible period, followed an expected recovery pattern and are better explained by another condition. The answer may be mixed. Some symptoms may be neurological, some psychological, some pain-related and some pre-existing. The court needs that distinction, not a convenient label.
Persistence does not prove ongoing brain injury.
Most people recover from concussion or mTBI within a relatively short period, although persistent symptoms can occur and may be disabling. Their continuation does not, by itself, prove continuing neurological injury. Persistent symptoms may reflect biological, psychological and social factors. The accident may begin the process, while poor sleep, pain, anxiety, reduced activity, fear of relapse, work stress or pre-existing vulnerability maintain it.
The expert should distinguish between symptoms directly caused by mTBI, secondary consequences of the accident and difficulties now better explained by other factors.
A claimant may remain genuinely impaired after the neurological injury has resolved. Conversely, persistent complaints may lack sufficient evidence of a continuing material relationship to the accident.
Why expert discipline matters.
mTBI claims may require evidence from neurology, neuropsychology, psychiatry, vestibular medicine, pain medicine or rehabilitation. The correct expert depends on the question.
A neurologist may address diagnosis and neurological causation. A neuropsychologist may assess cognitive function and test performance. A psychiatrist may consider anxiety, depression, trauma symptoms and functional impact. No expert should stray beyond their competence.
Neuropsychological and symptom-validity testing can assist, but neither provides a simple answer. Performance may be affected by pain, mood, sleep, medication, fatigue, education, language, cultural factors or effort. Poor results do not automatically establish fraud. They require careful interpretation within the complete evidence.
The credibility trap.
mTBI claims can quickly become credibility disputes. A claimant may report memory or concentration problems while continuing to work, drive, parent or socialise. That does not automatically disprove impairment; function is rarely all or nothing, and activity may be performed with greater effort or reduced tolerance.
Reported disability must nevertheless be tested against medical records, employment evidence and observed function. A single photograph or activity may prove little. A consistent pattern contradicting the alleged impairment may be significant. The expert should neither advocate for the claimant nor adopt the insurer’s suspicion. The task is to explain proportionately what the evidence supports.
What a strong mTBI report should do.
A strong report begins with chronology. It identifies the mechanism, acute symptoms, early records, any loss of consciousness or post-traumatic amnesia, treatment, recovery and development of ongoing complaints. It also considers prior head injury, migraine, psychiatric history, learning difficulties, sleep problems, substance misuse and relevant medication. The report should then answer plainly whether mTBI occurred, what evidence supports or undermines that diagnosis, whether symptoms are better explained by another condition and whether further specialist assessment is needed.
Diagnosis, causation, duration and prognosis should be addressed separately. A claimant may have sustained mTBI but recovered within weeks. Another may have developed persistent symptoms. A third may not have sustained mTBI but may still have an accident-related psychological injury. Those are different medico-legal outcomes and should not be blurred.
Why “mild” can mislead.
MTBI can be genuine, disabling and legally significant. It can also be over diagnosed or used to explain symptoms better accounted for by pain, psychological injury or another condition. The expert’s role is to hold the line between automatic dismissal and automatic attribution. The court needs an opinion connecting the mechanism, records, symptoms and functional impact through clear reasoning, even though the injury may be classified as mild, the evidence rarely is.
