Once called basilar migraine or basilar-type migraine, this presentation was renamed for a reason worth understanding: the old name implied the basilar artery was responsible, and that turned out to be wrong.
The current name — migraine with brainstem aura — describes where the symptoms originate rather than asserting a vascular cause that the evidence did not support.
What it looks like
This is aura arising from the brainstem, producing symptoms that are alarming precisely because they mimic serious neurological events.
Features include vertigo, slurred speech, ringing in the ears, reduced hearing, double vision, unsteadiness or ataxia, tingling on both sides of the body simultaneously, and in some cases reduced level of consciousness. At least two of these occur, they develop gradually over minutes, they are fully reversible, and they are followed by headache in most cases.
Critically, motor weakness is not part of this picture. If weakness is present, this is a different diagnosis and requires urgent evaluation.
It is more common in adolescents and young adults, more common in women, and frequently occurs in people who also have typical migraine with aura at other times.
Why the name changed
The original theory held that spasm of the basilar artery reduced blood flow to the brainstem, producing the symptoms. That model fell for the same reason the broader vascular theory of migraine fell.
Studies measuring regional cerebral blood flow during aura found that the flow reduction spreads slowly and continuously across the cortex, crossing the boundaries of major arterial territories — something vascular spasm cannot produce, because spasm is confined to the vessel it affects. These observations refuted the ischemic hypothesis.
Aura is a neural event. The current understanding is cortical spreading depression: a slow wave of neuronal and glial depolarization travelling at roughly three millimetres per minute, with blood flow changes following rather than causing it. In brainstem aura, the depolarizing process involves brainstem structures, which is why the symptom profile is vestibular, auditory, oculomotor and coordination-related rather than visual alone.
The headache that follows arises from trigeminovascular activation, release of calcitonin gene-related peptide and related neuropeptides, neurogenic inflammation and brainstem sensitization. Migraine is neurogenic. Vascular changes participate as part of the sequence; they are not the driver.
Where the upper cervical spine enters
Of all migraine presentations, this is the one where craniocervical anatomy is most directly relevant — because the symptoms are brainstem symptoms and the upper cervical spine has an unusually intimate relationship with the brainstem.
Sensory fibers from the upper three cervical nerve roots converge with trigeminal fibers onto shared second-order neurons in the upper spinal cord — the trigeminocervical complex, established neurophysiology. Dreyfuss, Michaelsen and Fletcher demonstrated the referral by provoking upper cervical joints in healthy volunteers. This relay sits immediately adjacent to the vestibular nuclei and the autonomic nuclei of the brainstem.
Separately, upper cervical proprioception feeds the vestibular system directly. The suboccipital muscles contain some of the highest muscle spindle densities in the human body, supplying the brainstem with the reference frame it needs to interpret vestibular and visual input at all.
When the atlas sits misaligned beneath the skull, that reference frame is distorted. Seaman and Winterstein described the consequence as dysafferentation — abnormal mechanoreceptor input altering central processing, muscle tone and autonomic regulation. A coherent framework, not validated in controlled trials.
The reasonable proposal: abnormal upper cervical input arriving at brainstem structures may lower the threshold for episodes originating there, and may contribute to the between-attack unsteadiness many of these patients describe. That is a hypothesis grounded in established anatomy. It is not a demonstrated cause.
Three mechanisms are commonly cited and require accurate labelling. The myodural bridge, established by Gary Hack and colleagues, connects the suboccipital muscles to the spinal dura — anatomically confirmed, clinically preliminary. Scott Rosa has published imaging observations and case series proposing craniocervical misalignment affects cerebrospinal fluid and venous flow at the junction; this is case-series and imaging work rather than controlled trials, using a proprietary patented method with commercially linked imaging technology. Michael Flanagan proposed the junction as a choke point affecting fluid circulation, venous drainage, arterial supply and brainstem regulation — a single-author hypothesis without controlled trial validation.
The safety section that matters most
These symptoms overlap almost completely with posterior circulation stroke, and that overlap is not academic.
Vertigo, double vision, slurred speech, unsteadiness and bilateral tingling are exactly the presentation of a brainstem or cerebellar stroke. The distinguishing features — gradual onset over minutes, full reversibility, a prior pattern of identical episodes, absence of weakness — are useful but not sufficient to rely on in the moment.
Call emergency services immediately if these symptoms appear for the first time, if they appear suddenly and fully formed rather than developing over minutes, if there is any weakness or facial droop, if speech is affected in a new way, if symptoms persist beyond an hour, or if there is any doubt whatsoever.
There is a further point a chiropractic website has an obligation to state plainly. Vertebral and carotid artery dissection can present with headache and neck pain alongside these neurological symptoms, and dissection has an established association with cervical manipulation — the direction of causation is debated, but the association is documented. Anyone presenting with new brainstem symptoms should be evaluated medically before any manual treatment of the neck is considered. This is not a situation where seeing a chiropractor first is appropriate.
What to do
Get a firm neurological diagnosis. Migraine with brainstem aura is a diagnosis reached after excluding vascular and structural causes, typically with imaging. It is not a self-diagnosis.
Note this for treatment: triptans and ergotamines are generally avoided in migraine with brainstem aura. This is a physician’s decision and it matters.
Track episodes carefully — which symptoms, order of onset, duration, what preceded them.
Discuss contraception, since migraine with aura carries elevated stroke risk with combined hormonal contraceptives.
Upper cervical evaluation
Only after neurological evaluation is complete. Assessment begins with specific testing to determine whether a misalignment is present. Where indicated, cone beam CT three-dimensional imaging locates the exact pattern on that individual’s anatomy. The correction is gentle and precisely directed, made without popping, twisting or yanking the neck, and the approach is oriented toward holding the correction, with follow-up testing determining whether an adjustment is needed.
Stated plainly: there is no controlled trial evidence that upper cervical care treats migraine with brainstem aura. Given the diagnostic overlap with stroke, medical clearance first is not a formality — it is the point.
Medical Disclaimer
This article is educational and does not constitute medical advice, diagnosis or treatment. Brainstem symptoms require urgent medical evaluation. Seek emergency care immediately for sudden vertigo, double vision, slurred speech, facial drooping, one-sided weakness, numbness, difficulty swallowing, loss of coordination, reduced consciousness, seizure, sudden severe headache unlike any before, or headache with fever, neck stiffness and confusion.
Learn more about upper cervical evaluation and care at neckwise.com.
Written by Dr. Drew Hall, Upper Cervical Chiropractor.