Central vs Peripheral Vertigo: How to Tell Them Apart
Both peripheral and central vertigo produce the illusion of movement (spinning) with nausea and imbalance, but they arise from very different sites — the inner ear/vestibular nerve versus the brainstem and cerebellum. The core axis that separates them is the presence of neurological signs and the pattern on the HINTS exam: peripheral causes stay confined to the vestibular apparatus, while central causes betray themselves with brainstem/cerebellar findings, an inability to walk, and a central HINTS pattern. Distinguishing them is critical because central vertigo may signal a posterior circulation stroke.
How to tell them apart
| Feature | Peripheral Vertigo | Central Vertigo |
|---|---|---|
| Severity | Tends to be severe and dramatic (e.g., vestibular neuritis) | Can be milder, but posterior circulation stroke may also cause severe vertigo — treat severity as a tendency, not a rule |
| Duration | Seconds to days (e.g., seconds in BPPV, days in vestibular neuritis) | Variable; often persistent until the underlying lesion is treated |
| Nystagmus | Horizontal or torsional, unidirectional (fast phase does not change direction with gaze), and suppressed by visual fixation | Any direction including vertical, direction-changing with gaze, and NOT suppressed by fixation |
| Hearing loss | May be present (e.g., Meniere's disease, labyrinthitis) | Usually absent |
| Neurological signs | Absent | Present — diplopia, dysarthria, dysphagia, weakness, facial numbness, crossed sensory loss, ataxia |
| Gait | Can walk, though unsteadily | Often cannot stand or walk unaided |
| HINTS pattern | Reassuring peripheral pattern — head-impulse test is ABNORMAL (a corrective catch-up saccade IS present), unidirectional horizontal nystagmus, and NO skew deviation | Dangerous central pattern (INFARCT) — head-impulse test is NORMAL (no corrective saccade), direction-changing or vertical nystagmus, and/or skew deviation on cover testing |
The reasoning
Anchor first on the associated features rather than on the vertigo itself, since both produce spinning and nausea and both can begin abruptly. The presence of ANY neurological sign — diplopia, dysarthria, dysphagia, limb weakness, facial numbness, or crossed sensory loss — pushes strongly toward a central lesion and mandates urgent brain imaging to exclude posterior circulation stroke. Analyze the nystagmus: unidirectional horizontal/torsional nystagmus that dampens with visual fixation is peripheral, whereas vertical or direction-changing nystagmus that persists despite fixation is central. Gait is a powerful discriminator: peripheral patients can usually walk (albeit unsteadily), while an inability to stand or walk suggests a cerebellar/central process. Finally, use the HINTS exam to arbitrate acute continuous vertigo — remember the polarity: an ABNORMAL head-impulse test (corrective saccade) with unidirectional nystagmus and no skew is the reassuring peripheral pattern, whereas a NORMAL head impulse, direction-changing/vertical nystagmus, or skew deviation is the central pattern that flags stroke.
Key tests
- HINTS exam (Head-Impulse, Nystagmus, Test-of-Skew): in the peripheral pattern the head-impulse test is abnormal (positive corrective saccade), nystagmus is unidirectional, and there is no skew — this triad is reassuring. A central pattern (INFARCT: Impulse Normal, Fast-phase Alternating, Refixation on Cover Test) — a normal head impulse, direction-changing/vertical nystagmus, or skew deviation — flags a central lesion and is more sensitive than early MRI for posterior stroke.
- Dix-Hallpike maneuver: in posterior canal BPPV it reproduces transient vertigo with an up-beating torsional nystagmus whose upper poles beat toward the dependent (affected) ear, appearing after a few seconds of latency and fatiguing on repetition; it is a positional test for peripheral BPPV and does not localize central lesions.
- Neurological examination for cranial nerve and cerebellar signs: unremarkable in peripheral vertigo, but reveals diplopia, dysarthria, weakness, facial numbness, Horner syndrome, or limb ataxia in central vertigo (e.g., lateral medullary/Wallenberg syndrome).
- MRI of the brain (with diffusion-weighted imaging): normal or shows a peripheral cause; in central vertigo it can demonstrate a posterior fossa lesion such as a brainstem or cerebellar stroke (and a gadolinium-enhancing cerebellopontine angle mass in acoustic neuroma).
- Audiometry/hearing assessment: may show sensorineural hearing loss in peripheral causes (Meniere's, labyrinthitis, acoustic neuroma), whereas hearing is usually preserved in central vertigo.
What they share
- Vertigo — the illusory sensation of spinning or movement
- Nausea and vomiting during episodes
- Some degree of gait instability or unsteadiness
- Sudden/abrupt onset — both peripheral causes (e.g., vestibular neuritis) and the highest-yield central cause (posterior circulation stroke) can begin acutely, so onset is a poor discriminator
Pitfalls
- Assuming severe, dramatic vertigo means a dangerous cause — peripheral vertigo is often intensely severe, while central vertigo can be milder; conversely, posterior circulation stroke can also cause severe vertigo, so severity alone never rules a lesion in or out.
- Getting the HINTS polarity backwards — a NORMAL head-impulse test is the worrisome (central) finding, while an ABNORMAL head-impulse test with a corrective saccade is the reassuring (peripheral) finding.
- Forgetting that some peripheral causes DO have hearing loss (Meniere's, labyrinthitis, acoustic neuroma); hearing loss does not exclude a peripheral etiology, but its usual absence in central vertigo is the point.
- Over-relying on positional testing — the Dix-Hallpike is for BPPV and will not reveal a central lesion; a patient who cannot walk needs neurological assessment and imaging.
- Missing a posterior fossa stroke because CT is often normal early; a normal CT does not rule out cerebellar or brainstem infarction, and the HINTS exam plus MRI (DWI) are more sensitive.
- Mislabeling vertical or direction-changing, non-suppressible nystagmus as benign — this pattern is central until proven otherwise.
- Using onset to discriminate — both peripheral and central vertigo can begin suddenly, so relying on abrupt onset to reassure is a trap.
Practice this the way the exam tests it — on branching cases where your decisions shape the patient.