Understanding the dizziness, imbalance, and visual disturbance that persists after a concussion — and why the upper cervical spine deserves a place in the conversation.
After a concussion, most patients expect to feel off for a few days or weeks. Headache. Some fogginess. Maybe nausea or sensitivity to light and sound. And for the majority of patients, that is essentially what happens — symptoms appear, the brain begins to recover, and within weeks life returns to something resembling normal. For a meaningful minority, however, the symptoms do not resolve on the expected timeline. Dizziness, imbalance, motion sensitivity, and visual disturbance persist for months or sometimes years, often becoming the dominant feature of the post-concussion experience.
This condition has a name: post-concussion vestibular dysfunction. It refers specifically to the cluster of balance, dizziness, and motion-related symptoms that persist beyond the expected recovery window after a concussion or mild traumatic brain injury. Recognition of the condition has grown substantially in the sports medicine and concussion research literature over the past decade, and treatment approaches have evolved alongside that recognition. But one component of the condition is still routinely missed in standard concussion care: the upper cervical spine, which is essentially always injured by the same forces that produced the concussion itself.
This guide walks through what post-concussion vestibular dysfunction actually is, the symptoms that define it, the underlying causes that produce it, and the diagnostic process used to identify it. The article also explains why the upper cervical spine deserves consideration in the workup, particularly for patients whose recovery has stalled despite standard care.
What Post-Concussion Vestibular Dysfunction Is
Post-concussion vestibular dysfunction is the persistence of balance, dizziness, and motion-related symptoms beyond the expected acute recovery window after a concussion. Vestibular symptoms appear in 50 to 80 percent of concussion patients during the acute phase. For most of these patients, the symptoms resolve over days to weeks. For approximately 30 percent of all concussion patients, however, symptoms persist for months or longer and become what is recognized as post-concussion syndrome — of which vestibular dysfunction is one of the most common and disabling components (Iverson et al., 2017).
The condition is not a single disease. It is the persistent expression of multiple underlying injuries that occurred simultaneously during the original concussion. Central vestibular processing can be disrupted by the brain injury itself. Peripheral vestibular dysfunction can occur from inner ear injury during the trauma. Visual system effects — convergence insufficiency, accommodation problems, saccadic abnormalities — can produce vestibular-like symptoms. And cervical proprioceptive dysfunction from upper cervical injury contributes to or maintains the vestibular symptoms in a meaningful subset of patients. The 2017 Berlin Consensus Statement on Concussion in Sport acknowledged the cervicogenic contribution to persistent post-concussion symptoms, and recognition continues to grow.
The Symptoms That Define Post-Concussion Vestibular Dysfunction
The symptom pattern of post-concussion vestibular dysfunction overlaps with several other vestibular conditions but has features that point toward the post-traumatic origin when the history is properly weighted.
Dizziness and disequilibrium
The most common symptom. Patients typically describe sensations of unsteadiness, swaying, rocking, or being off-balance rather than discrete spinning vertigo. The dizziness is often present continuously at a low level with periodic flares triggered by specific situations — head movement, busy visual environments, prolonged screen use, physical exertion, or fatigue. Many patients describe the condition as feeling like they are not quite solid, not properly oriented in space, or operating below their baseline at every level.
Positional or movement-triggered vertigo
Some patients experience true spinning vertigo triggered by specific head movements — typically rolling over in bed, sitting up, or tilting the head. When this pattern is present, it often represents BPPV from otoconia displaced during the original concussion impact. This is a separate, treatable condition that frequently coexists with the broader post-concussion vestibular dysfunction.
Motion sensitivity
Movement of any kind — head turns, walking, riding in vehicles, watching others move — provokes or worsens symptoms. Patients gradually learn to limit their movements, which over time produces deconditioning that worsens the overall picture.
Visual sensitivity and busy-environment intolerance
Difficulty in grocery stores, crowded sidewalks, scrolling screens, action movies, and patterned visual environments. The brain over-relies on visual input to compensate for the disrupted vestibular and proprioceptive systems, which makes complex visual environments destabilizing.
Headache
Post-concussion headache is nearly universal in the chronic post-concussion population. The headache pattern often includes both migrainous features (worsened by light, sound, and physical activity) and cervicogenic features (worsened by neck positions, originating in the suboccipital region and radiating forward). Many post-concussion patients have headaches that are partially or substantially cervicogenic, even though the workup typically attributes all post-concussion headache to the brain injury alone.
Brain fog and cognitive symptoms
Difficulty concentrating, finding words, retaining new information, and performing complex tasks. The cognitive symptoms reflect both the brain injury itself and the enormous energy cost of constantly managing distorted sensory integration.
Associated symptoms
Neck pain and stiffness, suboccipital tension, sleep disturbances, profound fatigue, anxiety and mood changes, sensitivity to light and sound, autonomic dysregulation (including in some cases POTS-like symptoms), and tinnitus or altered hearing in some patients. The constellation of symptoms reflects the multi-system impact of the original injury.
What Causes Post-Concussion Vestibular Dysfunction
The underlying causes operate at several levels simultaneously, and understanding them is essential to understanding why the condition persists in some patients and not others.
The concussion itself
The brain injury that produced the original concussion involves shearing of axons, disruption of normal ion gradients, and a metabolic cascade that affects multiple brain regions. The vestibular networks in the brainstem, cerebellum, and cortex are commonly affected, producing central vestibular dysfunction. In most patients, the brain heals over weeks to months. In some patients — particularly those with multiple prior concussions, more severe initial injuries, or complicating factors — central vestibular networks do not fully recover.
Inner ear concussion
The same forces that produce a brain concussion can also injure the inner ear structures. The vestibular apparatus and cochlea sit within the bony temporal bone but contain delicate sensory cells that can be damaged by the rapid acceleration-deceleration of the head. Inner ear concussion can produce hearing changes, tinnitus, and peripheral vestibular dysfunction that contributes to the overall symptom picture. BPPV from displaced otoconia is one of the most common consequences.
Visual system effects
Convergence insufficiency, accommodation dysfunction, and saccadic abnormalities are common after concussion and contribute to the dizziness and visual sensitivity many patients experience. The visual system is intimately involved in balance, and its dysfunction can produce vestibular-like symptoms even when the vestibular system itself is intact.
Upper cervical injury
This is the cause most often missed in standard post-concussion workups. The biomechanics that produce a concussion — rapid acceleration-deceleration of the head — also produce mechanical stress at the craniocervical junction. The brain inside the skull and the upper cervical spine are mechanically coupled; they cannot be injured independently when the mechanism involves head acceleration. The forces required to produce a concussion are essentially always sufficient to injure the ligaments and joint capsules at the top of the neck. Whiplash research has documented upper cervical ligamentous injury at forces well below those required for diagnosable concussion (Kaale et al., 2005), which means concussion patients have essentially always experienced forces well above the threshold for cervical injury.
The upper cervical injury produces ongoing distorted proprioceptive signaling — the deep neck joints and muscles continue to send abnormal information about head position to the brainstem. This distorted input then contributes to or maintains the vestibular dysfunction, often long after the brain side of the injury has largely healed.
Mechanism overlap
Most post-concussion vestibular dysfunction patients have contributions from multiple causes simultaneously. Brain involvement plus cervical injury plus visual system effects is a common combination. The proportions vary by patient, but the multi-mechanism nature of the condition is part of why a comprehensive approach to assessment and treatment matters.
How Post-Concussion Vestibular Dysfunction Is Diagnosed
The diagnosis is established clinically based on history, examination, and exclusion of alternative causes. There is no single confirmatory test.
Step 1: Documented concussion history
A clearly documented or clearly described concussion event preceding the symptoms — sports impact, motor vehicle accident, fall, assault, or other mechanism. The concussion does not need to have involved loss of consciousness (most do not). The mechanism, the temporal relationship to symptoms, and the symptom pattern matter more than whether the patient was knocked out. Some patients have multiple concussions in their history, and the cumulative effect contributes to their current presentation.
Step 2: Symptom pattern
Persistence of vestibular symptoms beyond the expected acute recovery window — typically more than 2 to 4 weeks post-injury for most concussion mechanisms, though longer windows apply for more significant injuries. The symptom cluster typically includes dizziness or imbalance, motion sensitivity, visual sensitivity, headache, and cognitive symptoms. The persistence and the constellation are both diagnostic.
Step 3: Clinical examination
Several clinical assessment tools have been developed specifically for post-concussion evaluation. The Vestibular/Ocular Motor Screening (VOMS) examines smooth pursuit, saccades, convergence, vestibulo-ocular reflex, and visual motion sensitivity. The Buffalo Concussion Treadmill Test assesses exercise tolerance and identifies the level at which symptoms are provoked. Balance assessment tools document the degree of postural instability. Cervical examination — when included — identifies the structural component that the brain-focused tools miss.
Step 4: Imaging when indicated
Standard CT and MRI are typically normal in uncomplicated post-concussion syndrome — they are obtained primarily to rule out more serious injury including subdural hematoma, contusion, or skull fracture, not to confirm concussion. Specialized imaging including diffusion tensor imaging (DTI) can document the white matter changes of concussion in research settings but is not yet routine in clinical practice. For the cervical component, three-dimensional cone beam computed tomography (CBCT) can document upper cervical structural changes that conventional two-dimensional X-rays cannot reliably capture.
Step 5: Excluding other causes
Post-concussion vestibular dysfunction shares features with several other conditions and can coexist with them. BPPV, vestibular migraine, persistent postural-perceptual dizziness (PPPD), and craniocervical instability all need to be considered. Many post-concussion patients meet criteria for one or more of these additional diagnoses, which can require separate or layered approaches to treatment.
Why the Upper Cervical Spine Belongs in the Conversation
Standard concussion care does not specifically evaluate the upper cervical spine. The vestibular rehabilitation addresses the central processing. The vision therapy addresses the convergence and accommodation. The graded exercise rehabilitation addresses the physiology of recovery. None of these specifically addresses the structural cervical injury that occurred alongside the brain injury, and for many patients this gap is the reason their recovery has plateaued.
The mechanical reality
Any force sufficient to produce a concussion is sufficient to injure the upper cervical spine. The brain and the neck are not separate systems that happen to be near each other — they are a single mechanical unit, and acceleration-deceleration of the head produces forces throughout that unit. The notion that concussion could occur without cervical injury, except in highly unusual circumstances, is biomechanically untenable. The cervical injury may not produce dramatic acute symptoms (most upper cervical ligamentous injuries do not), but the structural consequences persist.
The proprioceptive consequence
The upper cervical spine contains among the highest concentrations of proprioceptive receptors in the body. The deep suboccipital muscles and joint capsules continuously signal the brain about head position and motion (Kulkarni et al., 2001; McLain, 1994). These signals are integrated with vestibular and visual input in the brainstem to produce balance. Gdowski and McCrea’s 2000 study established the direct neuroanatomical projection from neck proprioceptive fibers to the vestibular nuclei — neck proprioception is not a peripheral modulator but one of the primary inputs the vestibular system uses to compute balance (Gdowski & McCrea, 2000).
When the upper cervical joints have been injured by the concussion, the proprioceptive signals from these joints become distorted. The brainstem receives a continuous stream of inaccurate information about head position. The central compensation process that the brain attempts after the original injury — recalibrating sensory integration to recover balance function — depends on having reliable input from the channels that remain. When the proprioceptive channel itself is distorted, the recalibration cannot proceed normally. This is why so many post-concussion vestibular dysfunction cases plateau: the brain is doing the work of recovery, but it is being given distorted information to work with.
The brainstem environment
Beyond the proprioceptive pathway, the upper cervical spine forms the bony corridor through which the brainstem passes. Michael Flanagan’s 2015 paper in Neurology Research International described the craniocervical junction as a potential choke point for craniospinal hydrodynamics — venous drainage, cerebrospinal fluid circulation, and the mechanical environment of the brainstem can all be affected by misalignment at this level (Flanagan, 2015). For a brainstem already struggling with the consequences of concussion, compromise of the corridor adds another layer of dysfunction.
How an Upper Cervical Evaluation Addresses This
Upper cervical chiropractic is a specialty within the broader chiropractic profession that focuses specifically on the precise structural relationship between the skull, atlas, and axis. The approach has features that make it particularly relevant for post-concussion patients.
Three-dimensional CBCT imaging
CBCT produces a true 3D reconstruction of the upper cervical anatomy and measures alignment to within fractions of a degree — precision that standard two-dimensional X-rays cannot match in this geometrically complex region. The imaging allows the practitioner to determine whether a meaningful structural injury occurred and exactly what its direction and magnitude are. For post-concussion patients, this is often the first time their upper cervical structure has been specifically evaluated.
Objective testing before any intervention
Two objective tests are performed at every visit. Leg length analysis measures functional postural asymmetry that reflects upper cervical misalignment. Paraspinal infrared thermography measures asymmetric autonomic activity along the cervical spine. If both tests indicate the spine is in alignment, no adjustment is delivered. If they indicate a shift, a precise correction is delivered along the vector calculated from the CBCT analysis. The principle of restraint guided by data is particularly appropriate for post-concussion patients who have often been through extensive prior treatment.
Precision without manipulation
When corrections are indicated, they are specific to the upper cervical segment and delivered along a calculated vector. There is no twisting, no popping, no full-spine manipulation. The force is low. The motion is small. For post-concussion patients — whose nervous systems are sensitized and whose vestibular systems are disrupted — this precision matters profoundly. Aggressive cervical manipulation can aggravate post-concussion symptoms and is generally contraindicated. Precision-based correction respects the sensitivity that exists.
When to Consider an Upper Cervical Evaluation
An upper cervical evaluation is worth considering for post-concussion patients when any of the following are true:
Your concussion involved an acceleration-deceleration mechanism — sports impact, motor vehicle accident, fall, assault — which describes essentially every concussion mechanism. Your symptoms have persisted beyond the expected acute recovery window. You have associated cervical symptoms — neck pain, suboccipital tension, restricted neck motion, cervicogenic headache — alongside your vestibular symptoms. Your vestibular rehabilitation has plateaued or has produced only partial improvement despite consistent engagement. Your symptoms vary with head and neck position. Your post-concussion headache includes a cervicogenic pattern (originating in the suboccipital region, worsened by neck positions). You have any history of prior concussions or significant neck trauma layered on top of the current injury. Your recovery has been slower or less complete than expected for your specific injury.
These criteria are not narrow. They describe the great majority of post-concussion patients, which reflects the underlying anatomical reality: the upper cervical component is essentially always present in concussion injuries, and evaluation is appropriate for most patients who continue to experience symptoms beyond the acute phase.
To find an upper cervical chiropractor near you, visit www.neckwise.com.
Where to Go From Here
Post-concussion vestibular dysfunction is a recognized, identifiable condition with multiple contributing causes. The standard treatments — vestibular rehabilitation, vision therapy, graded exercise rehabilitation, cognitive rehabilitation, and appropriate medical management — should be the foundation of care for any patient with the condition. For the meaningful subset of patients whose recovery has plateaued, who have substantial associated cervical symptoms, or whose history suggests significant cervical injury alongside the brain injury, the upper cervical spine deserves evaluation as part of a more complete approach. For many of these patients, the structural cervical component is the missing piece in their recovery.
To find an upper cervical chiropractor near you, visit www.neckwise.com.
References
- Iverson, G. L., Gardner, A. J., Terry, D. P., et al. (2017). Predictors of clinical recovery from concussion: A systematic review. British Journal of Sports Medicine, 51(12), 941–948.
- McCrory, P., Meeuwisse, W., Dvořák, J., et al. (2017). Consensus statement on concussion in sport — the 5th international conference on concussion in sport held in Berlin, October 2016. British Journal of Sports Medicine, 51(11), 838–847.
- Kaale, B. R., Krakenes, J., Albrektsen, G., & Wester, K. (2005). Head position and impact direction in whiplash injuries: Associations with MRI-verified lesions of ligaments and membranes in the upper cervical spine. Journal of Neurotrauma, 22(11), 1294–1302.
- Gdowski, G. T., & McCrea, R. A. (2000). Neck proprioceptive inputs to primate vestibular nucleus neurons. Experimental Brain Research, 135(4), 511–526.
- Kulkarni, V., Chandy, M. J., & Babu, K. S. (2001). Quantitative study of muscle spindles in suboccipital muscles of human foetuses. Neurology India, 49(4), 355–359.
- McLain, R. F. (1994). Mechanoreceptor endings in human cervical facet joints. Spine, 19(5), 495–501.
- Flanagan, M. F. (2015). The role of the craniocervical junction in craniospinal hydrodynamics and neurodegenerative conditions. Neurology Research International, 2015, Article 794829.
- Alsalaheen, B. A., Mucha, A., Morris, L. O., et al. (2016). Vestibular rehabilitation for dizziness and balance disorders after concussion. Journal of Neurologic Physical Therapy, 34(2), 87–93.
This article is educational in nature and does not constitute medical advice, diagnosis, or treatment. Individual results vary. Chiropractic care focuses on the structure and function of the spine and nervous system. Patients with concussion or post-concussion syndrome should pursue appropriate medical evaluation and management — including vestibular rehabilitation, vision therapy, graded exercise rehabilitation, and other evidence-based concussion care — alongside any structural assessment. No claim is made or implied that upper cervical chiropractic cures or treats any specific disease.