Build the case around the event, acute observations, evolving symptoms, function, and differential—not one scan or score.

Document the force: head impact, rapid acceleration or deceleration, rotation, fall, penetration, blast, object strike, or combined trauma. Preserve vehicle, equipment, scene, helmet or protective gear, photographs, video, emergency calls, witness accounts, and any electronic data. Identify body position, contacts, post-event movement, rescue, and secondary impacts. A dramatic mechanism does not diagnose brain injury, but it gives clinicians and technical experts the facts needed to assess plausibility.

Collect contemporaneous observations about loss or alteration of consciousness, confusion, amnesia, repeated questions, speech, balance, vomiting, headache, vision, hearing, seizure, weakness, agitation, fatigue, and behavior. Record exact words, time, and observer rather than converting lay observations into a Glasgow Coma Scale score or diagnosis. Sedation, intoxication, shock, pain, language, hearing, developmental status, and other injuries can affect the examination and should be noted.

Preserve emergency and hospital source records: trauma flowsheets, nursing checks, physician examinations, computed tomography and magnetic resonance imaging in native format, laboratory results, operative and intensive-care records, medication, consultations, discharge instructions, and follow-up referrals. Track diagnostic language over time. The National Institute of Neurological Disorders and Stroke explains that traumatic brain injury can be penetrating or non-penetrating and can cause immediate or secondary changes. The individual diagnosis belongs to treating professionals.

Track symptoms by domain and date: attention, processing speed, memory, executive function, language, headache, dizziness, vision, hearing, balance, sleep, fatigue, mood, irritability, anxiety, impulse control, and social behavior. Identify frequency, duration, triggers, recovery, treatment, and functional consequence. Avoid a daily checklist created only for litigation. Medical records, ordinary calendars, messages, work products, and consistent contemporaneous examples can provide stronger context.

Collect primary care, neurology, physical medicine and rehabilitation, neuropsychology, psychology or psychiatry, vestibular, vision, speech-language, occupational and physical therapy, pain, sleep, and other relevant records. Each discipline answers different questions. A neuropsychological evaluation can assess patterns of cognitive performance and validity within its method. It should be integrated with history, medical findings, language, education, culture, pain, sleep, medication, and psychiatric factors.

Measure real function. Compare pre- and post-event work accuracy, pace, supervision, attendance, decision-making, driving, finances, medication management, household tasks, parenting, relationships, recreation, and community activity. For students, collect attendance, grades, testing, accommodations, teacher observations, and return-to-learn plans with privacy protections. Family observations matter, but they should describe behavior and tasks rather than diagnose injury.

Build a pre-event record from medical, educational, employment, and functional evidence. Prior concussion, migraine, attention or learning issues, depression, anxiety, post-traumatic stress, sleep disorder, chronic pain, medication, substance use, sensory limitations, or other neurological conditions may overlap. The right question is what changed after the event and which cause or combination best explains the course—not whether the person had a perfectly blank history.

Link mechanism, acute findings, symptom onset, criteria, examinations, tests, treatment response, and function. Address delayed or inconsistent reporting. Symptoms may emerge when demands resume or have another source. Experts should identify method, relied-on information, alternatives, and certainty rather than treat timing alone as proof.

Separate diagnosis and causation from legal responsibility. A clinician may support brain injury but not know whether a driver, employer, product maker, property party, professional, or public entity was negligent. Clear fault does not establish every symptom or loss. Technical, medical, vocational, life-care, and economic experts should use defined roles and consistent facts.

Identify private, employer, contractor, product, premises, professional, public, Tribal, federal, and insurance parties. At work, separate compensation and exclusivity from potential third parties. For public entities, review Governmental Tort Claims Act procedure and federal law. For products, preserve the unit, history, warnings, alterations, and expert inspection. For children, include guardian authority, school records, privacy, development, and settlement procedure.

Future medical and rehabilitation evidence should identify provider, problem, treatment, medical necessity, probability, frequency, duration, and alternatives. Cognitive therapy, psychological care, medication, headache, vestibular or vision treatment, vocational support, supervision, transportation, or other services may matter. Do not turn a treatment recommendation into lifetime certainty.

Connect work symptoms and restrictions to actual demands. Obtain job descriptions, work product, accuracy, pace, supervision, attendance, accommodations, leave, benefits, earnings, promotions, and return attempts. Vocational opinions should use medically supported restrictions. Social Security disability applies a separate program standard; an award or denial does not measure tort loss.