Finding the Neurological Source of Your Dizziness, Vertigo, and Migraines: a Functional Neurology Approach in San Francisco

She had been to an ENT, a neurologist, and two urgent care clinics in fourteen months. Each visit ended the same way: labs normal, MRI clear, vestibular tests inconclusive. “It’s probably anxiety,” the last doctor offered, and she couldn’t entirely disagree, because the stress of not knowing had become its own kind of weight.

But anxiety didn’t explain why the fluorescent lights at the grocery store sent her retreating to her car. It didn’t explain the constant pressure behind her eyes, the way scrolling through her phone felt like standing on a moving boat, or the low-grade feeling of rocking that followed her from room to room. And it certainly didn’t explain the spinning episodes that arrived without warning when she turned her head too fast or spent too long in a visually busy environment.

What she had was vestibular migraine, the most common neurological cause of recurring vertigo in adults, and one of the most persistently misdiagnosed. And what was driving it was not a single broken part, but a brain that had gradually, under the weight of compounding stressors, lost its ability to regulate itself.

If this story sounds familiar (the unanswered questions, the spinning episodes, the headaches that come and go without warning), you are not alone. Vestibular migraine in San Francisco and across the Bay Area is far more prevalent than most patients realize. More importantly, it is measurable, traceable to a specific neurological source, and genuinely treatable when the right tools are applied.

When the World Won’t Stop Spinning: The Brain Science of Vestibular Migraine

Vestibular migraine is not simply a migraine with dizziness tacked on. It is a disorder rooted in how the brain processes and integrates sensory information, and understanding it requires looking at three converging layers of dysfunction, each one amplifying the next.

Layer 1: The CGRP Cascade and the Neurochemistry of an Overactivated Pain System

The story begins with the trigeminovascular system, a network of pain-sensing nerve fibers that wrap around the blood vessels of the brain and extend into the inner ear. In people with vestibular migraine, this system becomes dysregulated, releasing a cascade of vasoactive neuropeptides, particularly calcitonin gene-related peptide (CGRP), that simultaneously generate headache pain and sensitize the vestibular nuclei deep in the brainstem.

Research published in Frontiers in Neurology found that CGRP levels remain measurably elevated in migraine patients not just during attacks but between them, meaning the brain is not simply reacting to a trigger, but maintaining a state of low-grade neurogenic inflammation between episodes. This is a brain chemistry disorder, not an inner-ear structural one.

Figure: The CGRP sensitization cascade in migraine. CGRP released at the dura and trigeminal ganglion activates the trigeminal nucleus caudalis, relaying pain signals upward through the thalamus to the cortex. Insets show the synaptic mechanism of CGRP receptor binding (right) and the normalization of dilated dural blood vessels when the pathway is blocked (left). Adapted from Bell, I.M. (2014). Journal of Medicinal Chemistry, 57, 7838–7858.

Layer 2: The Trigeminal-Cervical Complex: Where the Neck Meets the Brain

Here is a detail that surprises most patients: the trigeminal nerve (the main sensory nerve of the face and scalp) shares a brainstem processing hub with the upper cervical nerve roots from C1, C2, and C3 in your neck. This hub is called the Trigeminal-Cervical Complex (TCC).

When the trigeminovascular system becomes overactivated, CGRP floods the TCC. From there, sensitization doesn’t stay local; it spreads upward into the vestibular nuclei and outward into the vasculature of the inner ear. This is why neck tension worsens migraine severity. This is why head posture and upper cervical restriction directly amplify episodes. And this is why dizziness and migraine so often travel together: they share the same convergence zone.

Figure: The Trigeminal-Cervical Complex, where trigeminal pain pathways (V1/V2/V3), upper cervical roots (C1–C3), and CGRP-driven sensitization converge to produce the brainstem dysfunction underlying vestibular migraine.

Layer 3: Allostatic Load: When Chronic Stress Rewires the Brain’s Pain Threshold

There is a third layer that most migraine discussions overlook entirely, and it is often the key to understanding why one person’s vestibular migraine improves with simple treatment while another’s becomes relentless: allostatic load.

Allostatic load is the cumulative neurological and physiological wear and tear caused by chronic stress. It is not a single traumatic event, but the compounding weight of sustained psychological pressure, disrupted sleep, mood instability, and unrelenting pain. Researchers have found that repeated physiological or psychological stressors impair the hypothalamic-pituitary-adrenal (HPA) axis, the brain’s master stress-response system, to the point where it stops adapting normally and instead triggers structural and functional changes in brain networks.

The consequences are direct and measurable. Chronic exposure to elevated cortisol (the HPA axis’s primary stress hormone) drives neuroinflammation, lowers the threshold for cortical spreading depression (the electrical wave underlying migraine aura), and degrades the brain’s descending pain modulation pathways, the systems the brain uses to dampen incoming pain signals. The result is not just a stress response. It is a brain that has been neurobiologically remodeled toward hypersensitivity. What was once a manageable reaction to a trigger becomes a persistent, hair-trigger state in which the nervous system treats every sensory input as a potential threat.

This is why migraine, major depressive disorder, generalized anxiety, fibromyalgia, and chronic pain so frequently coexist in the same patient. They are not separate conditions that happen to overlap; they share a common underlying biology. Serotonin and dopamine, the neurotransmitters that govern mood, simultaneously gatekeep pain signals throughout the central nervous system. When chronic stress or mood dysregulation depletes them, both the emotional and pain-processing systems become dysregulated at once. Research published in Frontiers in Human Neuroscience confirms that migraine, depression, and anxiety share common pathomechanisms at the level of limbic system function, particularly in the amygdala, the anterior cingulate cortex (ACC), and the periaqueductal gray (PAG): the brain regions that process both the emotional distress of a mood disorder and the physical sensation of pain. Dysfunction in one directly amplifies the other, creating a cycle of sensitization that is self-reinforcing unless deliberately interrupted.

“The brain that is chronically stressed is a brain that is chronically primed for pain. Vestibular migraine, in many patients, is not just a neurochemical event. It is the neurological expression of a system that has been pushed past its capacity to self-regulate.”

This is the full picture of vestibular migraine as we understand it today: not a single pathway misfiring, but three converging layers (trigeminovascular neurochemistry, brainstem convergence at the TCC, and allostatic failure of the brain’s own regulatory systems) reinforcing each other in an ongoing cycle of sensitization. Tracing all three layers, and measuring the brain function that reflects them, is what the NeuroAxis evaluation is designed to do.

The Misdiagnosis Trap: Why Vestibular Migraine Is So Often Missed

Vestibular migraine is estimated to affect between one and three percent of the general population, and yet it remains one of the most persistently underdiagnosed neurological conditions in clinical medicine. The reason is straightforward: it is a shape-shifter.

Three Conditions It Mimics

When vertigo episodes are brief and triggered by head movement, vestibular migraine looks exactly like BPPV (benign paroxysmal positional vertigo), the mechanical inner-ear condition caused by displaced calcium crystals. When episodes are longer with ear fullness or muffled hearing, it mimics Menière’s disease. When anxiety and light sensitivity dominate the picture, particularly in a patient who also carries a diagnosis of depression or generalized anxiety, it gets filed under panic disorder or a psychiatric condition.

That last misattribution is especially common and especially consequential. Because allostatic load, mood dysregulation, and migraine genuinely share neurobiology, clinicians understandably interpret the anxiety and emotional dysregulation as the primary diagnosis, missing the neurological driver underneath. The patient is treated for anxiety while their brain’s sensitization cycle continues unchecked.

And when a headache doesn’t accompany the vertigo (which happens in a substantial proportion of episodes), the migraine connection is missed entirely.

Figure: Vestibular migraine vs. BPPV: key differences in episode duration, triggers, and associated symptoms.

Why Standard Testing Falls Short

Standard vestibular testing, including routine VNG and audiology, often returns normal results in vestibular migraine patients. A conventional MRI or CT shows no structural abnormality. There is no blood test for allostatic load, no imaging marker for thalamocortical dysrhythmia, no standard workup that reveals whether a patient’s brain has lost its capacity to habituate to sensory input.

Without positive findings on standard workups, clinicians have little to anchor a diagnosis, and patients cycle through specialists, collecting normal results and unsatisfying explanations.

Here is the gap that functional neurology is built to fill: where conventional care sees a symptom, we see a circuit. The absence of a structural lesion does not mean the brain is functioning normally. It means the dysfunction is functional, embedded in how the brain processes, communicates, and integrates information across its networks. That kind of dysfunction requires objective, functional measurement to find.

“Normal MRI. Normal labs. Normal hearing test. And yet the world won’t stop moving. If this is your story, it doesn’t mean nothing is wrong. It means the right test hasn’t been run yet.”

💡 Does this sound familiar? Many of our patients spent years cycling through specialists before finding answers. Schedule a free 15-minute phone consultation → and speak directly with our team about whether a Functional Neurology Evaluation is right for you. No commitment, no pressure, just answers.

The NeuroAxis Health Approach: Mapping the Brain Behind the Symptoms

At NeuroAxis Health, San Francisco’s functional neurology clinic in Nob Hill, the Functional Neurology Evaluation does what standard workups cannot: it objectively measures how your brain and nervous system process sensory and motor information across seven key areas of brain and physical function, and pinpoints where along the NeuroAxis the breakdown is occurring.

For vestibular migraine patients, every domain reveals a different layer of the sensitization cycle. Here is what we measure, and why it matters:

1. Brainwaves → Quantitative Electroencephalography (qEEG)

qEEG is arguably the most powerful tool in the vestibular migraine evaluation, because it makes the invisible visible. It maps the relative power, coherence, and phase relationships of brainwaves across all major frequency bands, and in vestibular migraine patients, what it reveals is a specific set of electrophysiological signatures that reflect the exact neurological mechanisms described above.

Researchers have identified three distinct EEG phenotypes that characterize the sensitized migraine brain, each one a measurable biomarker of a different aspect of the dysfunction:

Thalamocortical Dysrhythmia (TCD): The most consistent transdiagnostic pattern seen across migraine, chronic pain, and depression is a resting-state increase in low-frequency activity (elevated delta and theta power) alongside a slowing of the dominant alpha rhythm. This reflects a breakdown in how the thalamus relays and filters sensory information to the cortex. The thalamus normally acts as the brain’s gatekeeper, deciding what sensory input deserves the cortex’s attention. In TCD, that gating fails: the brain is kept in a hypersensitive, non-habituating state, treating background noise, light, and motion as perpetual alerts. This is the neurophysiological signature of the allostatic-load brain: measurable, repeatable, and directly relevant to why a patient cannot tolerate a grocery store.

Cortical Hyperexcitability (Elevated Beta/Gamma): Under cognitive load or sensory stimulation, vestibular migraine and chronic headache patients frequently demonstrate elevated gamma and beta band oscillations, particularly in occipital regions. This phenotype corresponds clinically to sensory overload, photophobia, and a dramatically lowered threshold for triggering an episode. The brain is not just more sensitive; it is electrically overreactive, firing at intensities appropriate for genuine threats in response to ordinary sensory input.

Altered Habituation: Healthy brains “tune out” repetitive sensory stimuli (a blinking light, a background hum) through a process called habituation. In the sensitized migraine brain, this capacity is impaired. EEG-measured evoked potentials show that the cortex treats every incoming stimulus as a fresh signal requiring a full response, rather than downregulating after the first few encounters. The practical result: neural energy is continuously drained, the threshold for attack is constantly eroded, and the nervous system cannot find genuine rest between episodes. Research across multiple peer-reviewed publications in PMC-indexed journals identifies this altered habituation as one of the most consistent neurophysiological markers distinguishing the chronic migraine brain from healthy controls.

The qEEG makes all three of these phenotypes visible and measurable, providing an objective map of the brain’s sensitization state that no symptom questionnaire or standard imaging study can offer. A systematic review in Frontiers in Human Neuroscience identified altered brainwave patterns in delta, theta, and alpha frequencies as consistent, measurable markers of the migraine brain, describing qEEG as a potential objective neurophysiological “fingerprint” for migraine-related dysregulation. This is precisely what we look for, and precisely what guides treatment.

2. Cognition → Computerized Neuro-Cognitive Testing

The brain fog of vestibular migraine is not vague or psychosomatic; it is the cognitive expression of thalamocortical dysrhythmia and allostatic load operating at higher cortical levels. Computerized cognitive testing measures attention, concentration, memory, visual processing, and problem-solving objectively, giving us a neurological report card for the functions patients notice deteriorating between episodes. This provides both a diagnostic baseline and a measurable outcome metric as treatment progresses.

3. Visual-Oculomotor → Video-Oculography (Voluntary Eye Movements)

The light sensitivity, motion intolerance, and difficulty with scrolling or visually busy environments that vestibular migraine patients describe are not purely sensory; they are the clinical expression of cortical hyperexcitability in occipital networks and impaired thalamocortical gating. Voluntary eye movement testing makes that dysfunction visible by measuring the central brain pathways connecting brainstem, cerebellum, and cortex, revealing exactly where the visual processing breakdown is occurring.

4. Vestibular → Video-Oculography (Reflex Eye Movements)

The inner ear communicates with the brain continuously through reflex eye movements, and those reflexes can be precisely measured. By analyzing how the eyes respond to vestibular input, we identify asymmetries in peripheral and central vestibular processing, distinguishing a brainstem-level deficit from an inner ear problem, and separating vestibular migraine patterns from BPPV or Menière’s disease. When deeper assessment is needed, air caloric testing directly stimulates each ear canal independently.

5. Somatosensory → Physical & Neurological Exam

A comprehensive musculoskeletal, orthopedic, and neurological examination evaluates how the body’s sensory systems feed information up through the NeuroAxis. Given what we know about the TCC, the cervical spine plays a direct role in vestibular migraine: tension, restricted mobility, and aberrant sensory input from the neck contribute to the central sensitization driving episodes. This exam identifies those contributing factors so they can be targeted in treatment alongside the neurological program.

6. Autonomic Function → Autonomic Testing

Autonomic dysregulation sits at the intersection of every layer of vestibular migraine pathophysiology. The HPA axis (the system that chronic stress dysregulates) directly governs the autonomic nervous system’s balance between sympathetic (“fight or flight”) and parasympathetic (“rest and repair”) tone. When allostatic load is high, the sympathetic system is chronically elevated: heart rate variability falls, orthostatic regulation becomes unstable, and the brain’s vascular environment, already sensitized by CGRP, is further compromised by dysregulated blood flow.

We measure orthostatic blood pressure, heart rate variability, respiratory rate, skin conductance, and temperature: the nervous system’s own report on how well it is managing its stress response and recovery capacity. These are not secondary findings in vestibular migraine; they are frequently the missing piece that explains why a patient’s episodes are worsening despite other treatment.

7. Physiology → Laboratory Testing

Neurological symptoms do not exist in a biochemical vacuum. Allostatic load has downstream physiological effects (on inflammatory markers, cortisol regulation, nutritional status, and hormonal balance) that either support or undermine the brain’s ability to regulate itself and recover. When indicated, laboratory testing examines these factors individually and coordinates with the patient’s primary care physician or through a private lab.

The Treatment Approach: Three Pillars Targeting the Full Sensitization Cycle

Once the evaluation maps your specific pattern of dysfunction (the CGRP-driven brainstem sensitization, the TCC contributions, the EEG phenotypes of thalamocortical dysrhythmia and cortical hyperexcitability, the autonomic imbalance), treatment is built to address all of it, not just the most visible symptom.

Your brain can change. That is not a platitude; it is the neuroscience of neuroplasticity, the brain’s lifelong capacity to reorganize, rewire, and recover. Our entire treatment philosophy is built on activating that capacity with precision, guided by objective data.

Neuromodulation works at the cellular level, promoting healing, restoring energy metabolism in sensitized neurons, and actively stimulating the neuroplastic changes that create the biological foundation for recovery. For a brain that has been neurobiologically remodeled by allostatic load (its descending pain modulation pathways degraded, its neuroinflammatory tone elevated), neuromodulation begins to restore the tissue-level conditions that make self-regulation possible again. Think of it as preparing the brain for change.

Neurofeedback is where the EEG phenotypes become the target. Using real-time qEEG feedback, the brain learns, without conscious effort, to shift its own brainwave patterns toward healthier, more regulated states. Thalamocortical dysrhythmia, with its excess delta and theta and slowed alpha, is directly trainable: as sessions progress, the dominant alpha rhythm strengthens, the thalamocortical gating function improves, and the brain’s capacity to habituate to sensory input is gradually restored. The cortical hyperexcitability that generates photophobia and sensory overload quiets. The altered habituation that drains neural energy and erodes the attack threshold normalizes. This is precision neurological training: operant conditioning for the exact brain networks the qEEG identified as dysregulated in your evaluation.

Neurorehabilitation and Chiropractic Care target the vestibular, visual, sensory-motor, and cervical systems directly, using gaze stabilization exercises, balance retraining, vestibular maneuvers, and spinal care to strengthen the specific circuits found to be dysfunctional. Cervical care is often integral given the TCC’s role: restoring mobility and reducing aberrant sensory input from the neck directly quiets the convergence zone driving sensitization. Breathing retraining and biofeedback address the autonomic component, shifting the nervous system’s chronic sympathetic overdrive toward the parasympathetic recovery state that allows the HPA axis to reset.

These three pillars work in concert, each one reinforcing the others, to break the sensitization cycle at every level it operates. We don’t guess. We measure, then we treat what the data shows.

What to Expect at NeuroAxis Health

Your first visit begins with a thorough intake: a detailed history of your vestibular migraine episodes, your triggers, your stress history, your sleep and mood: the full picture of the allostatic load your brain has been carrying. Dr. Rachman Chung, DC, DACNB, FACFN, QEEG-DL, and Dr. Jessica Tolentino, DC, QEEG-DL, take time to understand the complete neurological and physiological context before a single test is run.

The Functional Neurology Evaluation itself is comprehensive but unhurried. You will have qEEG brain mapping, vestibular and oculomotor testing via video-oculography, autonomic measurements, and a full neurological and musculoskeletal examination. At the end, findings are reviewed with you in plain language. It is not a data dump, but a clear clinical narrative: here is what your brain is doing, here is where the dysfunction is, here is the sensitization cycle that is driving your episodes, and here is how we are going to address it.

Treatment programs are individualized to your findings. Many patients begin to notice meaningful improvement in episode frequency and severity within the first four to six weeks of integrated care. The goal is not just fewer episodes; it is a brain that is genuinely better regulated, more resilient, and more capable of maintaining its own equilibrium without being derailed by ordinary sensory input.

Frequently Asked Questions About Vestibular Migraine

What is the difference between vestibular migraine and BPPV?

BPPV is caused by displaced calcium crystals in the inner ear canals, typically producing brief spinning triggered by specific head positions: a mechanical problem with a mechanical solution. Vestibular migraine is a neurological disorder rooted in how the brain processes vestibular signals at the brainstem and cortex, driven by CGRP sensitization, TCC convergence, and central hyperexcitability. Episodes can last minutes to days, are often triggered by light, sound, stress, or visual complexity, and are not fixed by repositioning maneuvers alone.

Can vestibular migraine occur without a headache?

Yes, and this is one of the main reasons it goes undiagnosed. A significant proportion of vestibular migraine episodes occur without any head pain at all. When dizziness, brain fog, light sensitivity, and rocking sensations appear without a classic headache, the migraine connection is frequently missed. The diagnosis is clinical and neurological, not dependent on the presence of pain.

What is the connection between stress, anxiety, and vestibular migraine?

The connection is neurobiological, not psychological. Chronic stress dysregulates the HPA axis, elevates cortisol, drives neuroinflammation, and lowers the brain’s threshold for migraine attacks through cortical spreading depression. Depression and anxiety share common neural pathways with migraine, particularly in the limbic system, meaning mood dysregulation directly amplifies the central sensitization driving vestibular migraine. This is why many patients notice their episodes worsen during high-stress periods, and why addressing the autonomic and stress components is an integral part of effective treatment.

What triggers vestibular migraine?

Common triggers include hormonal fluctuations, sleep disruption, psychological stress, bright or flickering lights, visually complex environments, certain foods (aged cheeses, alcohol, caffeine), barometric pressure changes, and physical exertion. The sensitized brain has a lowered threshold across all of these, which is why reducing the overall sensitization load, not just avoiding individual triggers, is the most durable treatment strategy.

Is vestibular migraine treatable without medication?

Many patients achieve significant improvement through non-pharmacological approaches, particularly when treatment is guided by objective neurological testing that identifies the specific EEG phenotypes and autonomic patterns driving their sensitivity. Neurofeedback, neuromodulation, vestibular rehabilitation, autonomic retraining, and targeted chiropractic care can address the underlying neurological dysregulation at every level. For some patients, medication remains part of the picture; for others, a comprehensive functional neurology approach provides lasting relief without it.

How long does vestibular migraine treatment take?

Many patients begin to notice meaningful improvement within the first four to six weeks of integrated care. Because treatment is personalized to objective findings (targeting the specific EEG phenotypes, autonomic patterns, and structural contributors identified in your evaluation), outcomes tend to be more targeted and durable than one-size-fits-all approaches.

How do I know if a Functional Neurology Evaluation is right for me?

If you have been experiencing recurring dizziness, vertigo, visual motion sensitivity, brain fog, or headaches, especially alongside stress, mood challenges, or a sense that your nervous system is chronically overactivated, a Functional Neurology Evaluation is designed specifically for you. It measures what standard workups cannot: the electrophysiological, vestibular, autonomic, and cognitive function of your nervous system across seven key areas. The free 15-minute phone consultation is the right first step.

Ready to Find Answers? Start with a Free Consultation

If you have been living with recurring dizziness, vertigo, and headaches, and no one has been able to give you a real explanation, you deserve an evaluation designed to actually find the answer.

At NeuroAxis Health, San Francisco’s functional neurology clinic in Nob Hill, we specialize in exactly this: tracing your symptoms back to their neurological source, measuring the full sensitization cycle (the CGRP chemistry, the brainstem convergence, the allostatic load, the EEG phenotypes) and building a personalized program to restore what has gone out of balance.

Your brain has the capacity to change, to recalibrate, to heal. We have the tools to show you exactly where to begin, and the data to guide every step of the process.

Take the first step today. Schedule a free 15-minute phone consultation. No commitment, no pressure, just a direct conversation with a specialist who understands vestibular migraine from the inside out.

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Disclaimer: This article is intended for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Individual results vary. Please consult a qualified healthcare professional for evaluation and personalized care of any medical condition.