Ongoing dizziness, headache, light and sound sensitivity, and brain fog after a head injury usually get filed under one label: a concussion that hasn't cleared. The same symptom set also defines vestibular migraine — a distinct, manageable condition that head trauma can trigger — and the two can be symptomatically identical [1]. What separates them is history plus instrumented assessment, and the distinction changes the care plan.
Why the two get mixed up
Post-concussive syndrome and vestibular migraine overlap almost point for point: dizziness, headache, photophobia, phonophobia, difficulty concentrating, brain fog [1]. On paper, the main distinguishing factor is a history of head trauma — but trauma doesn't rule vestibular migraine out, because migraine-associated dizziness is one of the recognized patterns dizziness takes after head injury [1,2]. In other words: the injury may not simply be slow to heal. It may have switched on a condition with a name, criteria, and management options of its own.
What vestibular migraine actually is
Vestibular migraine has formal diagnostic criteria, developed by the Bárány Society and carried in the International Classification of Headache Disorders (ICHD-3): at least five episodes of moderate-to-severe vestibular symptoms lasting five minutes to 72 hours, a current or past history of migraine, and migraine features — one-sided pulsating headache, light and sound sensitivity, or visual aura — accompanying at least half of the episodes [3]. There is no blood test or scan for it; the diagnosis is clinical, which is one reason it is made far less often than it occurs [4].
How much less often? In one analysis of US national health-survey data, 91% of people whose symptoms met study criteria for vestibular migraine had no vestibular migraine diagnosis — despite an average of about two providers seen for their complaints — and only 2.4% carried any migraine diagnosis at all [1]. In dizziness clinics, vestibular migraine accounts for roughly 7–12% of patients [4].
Dizziness after a head injury has more than one cause
Clinical work on post-traumatic dizziness distinguishes several patterns: positional vertigo (BPPV) from displaced inner-ear crystals, exertion-induced dizziness, migraine-associated dizziness, and spatial disorientation — each with different findings on examination and vestibular testing [2]. Concussion itself commonly disrupts gaze stability and oculomotor functions — smooth pursuit, saccades, convergence — which produces dizziness of its own [1]. These causes can coexist, and none of them is visible on routine structural imaging.
Why the distinction changes the plan
Each driver answers to different care. Post-traumatic BPPV responds to repositioning maneuvers. Vestibular migraine is managed as migraine — trigger management and medication decisions that stay with your physician — with vestibular rehabilitation where testing shows a deficit; clinicians note that migraine-directed treatment of post-concussive dizziness meets variable success, which is exactly why identifying who actually has vestibular migraine matters [1]. Oculomotor and gaze-stability deficits after concussion respond to targeted retraining as part of post-concussion care, graded sub-symptom-threshold aerobic exercise has randomized-trial support in sport-related concussion [5], and vestibular rehabilitation carries systematic-review evidence for unilateral peripheral vestibular dysfunction [6].
How assessment settles it
A structured history separates the patterns — minutes-to-days spells with migraine features, constant unsteadiness, positional spins — and instrumented testing does the rest: oculomotor testing, gaze-stability and head-impulse measures, positional testing, and posturography quantify what each system is doing [2]. That is the assessment logic of the MindForge Discovery Day — comprehensive neurological evaluation + report of findings + care plan — built for exactly this kind of ambiguous, instrument-answerable question.
MindForge is an instrumented, intensive brain center for neurological rehabilitation near Galleria Dallas. If your dizziness has outlasted its explanation, start with a free 15-minute call with our care team: your questions answered, the Discovery Day scheduled live on the call if it makes sense, and a clear answer about whether this is the right place for you — in either direction. Or call (214) 730-6463.
Sources
1. Disorders of the Vestibular System: Diagnosis and Rehabilitation. Chapters on vestibular migraine differential diagnosis and concussion-related vestibular dysfunction.
2. Hoffer ME, et al. Classification of post-traumatic dizziness after closed head injury. Elsevier handbook chapter on posttraumatic balance disorders.
3. Lempert T. Vestibular Migraine: Epidemiology, Classification, and Clinical Features. In: Colombo B, Teggi R, eds. Vestibular Migraine and Other Episodic Vertigos: An Update. Springer; 2025.
4. Vertigo and Dizziness: Common Complaints. Chapter on vestibular migraine.
5. Leddy JJ, et al. Early Subthreshold Aerobic Exercise for Sport-Related Concussion: A Randomized Clinical Trial. JAMA Pediatrics. 2019;173(4):319–325.
6. McDonnell MN, Hillier SL. Vestibular rehabilitation for unilateral peripheral vestibular dysfunction. Cochrane Database of Systematic Reviews. 2015;(1):CD005397.