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Vestibular Neuritis

Vestibular Neuritis ยท H81.2

Vestibular neuritis: viral etiology, acute vertigo presentation, vestibular function testing, differentiation from stroke, and rehabilitation with vestibular exercises.

2026-03-28

At a Glance

Vestibular neuritis: viral etiology, acute vertigo presentation, vestibular function testing, differentiation from stroke, and rehabilitation with vestibular exercises.

Definition and Overview

Vestibular neuritis is an acute peripheral vestibular disorder in which inflammation of the vestibular nerve (the vestibular branch of cranial nerve VIII), which connects the inner ear to the brain, causes sudden severe rotational vertigo [1]. A characteristic feature is that the auditory nerve is preserved, so hearing loss does not accompany the condition.

It is the third most common cause of acute vertigo, with an annual incidence of approximately 3.5 per 100,000 population [1]. It occurs at all ages but is most common in the 30s to 60s with seasonal variation.

Causes

Viral infection is presumed to be the primary cause. There are case reports of herpes simplex virus-1 (HSV-1) DNA detected in histological examination of the vestibular nerve, and the most prevailing hypothesis is that reactivation of latent infection triggers vestibular neuritis [1][3].

Clinically, the condition frequently occurs after upper respiratory infections or influenza, strongly suggesting an association with viral infection [3]. Autoimmune mechanisms or microvascular dysfunction may also be involved in some cases.

Symptoms

Acute Phase (1-3 days)

  • Sudden severe rotational vertigo: Begins over minutes and persists for several days. Dizziness is present even at rest and worsened by movement.
  • Nausea and vomiting: Repeated vomiting due to severe vertigo.
  • Spontaneous nystagmus: Horizontal-torsional nystagmus beating toward the unaffected side.
  • Gait instability: Gait deviation toward the affected side.
  • Preserved hearing: The absence of hearing loss and tinnitus distinguishes this from Meniere's disease.

Recovery Phase (days to weeks)

Acute vertigo gradually subsides and ambulation becomes possible, but instability with rapid head movements persists. Reduced vestibulo-ocular reflex response to head movements on the affected side continues.

Sequelae

  • Secondary BPPV: BPPV develops in approximately 10% of patients after vestibular neuritis.
  • Persistent postural-perceptual dizziness (PPPD): Some cases transition to chronic dizziness with the addition of psychological factors after vestibular neuritis.

Diagnosis

Video Head Impulse Test (vHIT)

Catch-up saccades are observed during head impulses toward the affected semicircular canal, confirming vestibulo-ocular reflex dysfunction [5]. This is a critical test for differentiating vestibular neuritis from stroke.

In stroke-related vertigo, the head impulse test is normal (the "H" in the HINTS protocol), suggesting a central etiology [5].

Videonystagmography

The direction, intensity, and gaze-dependent changes of spontaneous nystagmus are recorded. In vestibular neuritis, horizontal-torsional spontaneous nystagmus beating toward the healthy side is observed with preserved gaze suppression. Central nystagmus has variable directions and lacks gaze suppression.

Caloric Test

Warm and cold water are instilled into the external ear canal to compare bilateral vestibular function. If the affected semicircular canal's response is significantly lower than the healthy side (Canal Paresis > 25%), unilateral vestibular hypofunction is diagnosed.

Brain MRI

Diffusion-weighted MRI (DWI) is performed to exclude central causes such as stroke or cerebellar hemorrhage. However, cerebellar infarction may not be detected on DWI within the initial 48 hours, making clinical judgment important [5].

Treatment

Acute Symptom Management

  • Antivertiginous agents (meclizine, dimenhydrinate): Acute phase vertigo relief.
  • Antiemetics (metoclopramide, ondansetron): Nausea and vomiting control.
  • Benzodiazepines: Short-term use in the acute phase. Long-term use impairs vestibular compensation.

Medications are used restrictively only during the acute phase (several days). Continued use thereafter may delay central compensation.

Corticosteroid Therapy

Studies suggest that early methylprednisolone (tapering from 100 mg) promotes vestibular function recovery [2]. Treatment should ideally be initiated within 48-72 hours of symptom onset. However, evidence for long-term functional outcomes is limited [2].

Vestibular Rehabilitation Exercises

Vestibular rehabilitation exercise is the most important long-term treatment for vestibular neuritis recovery [4]. According to the Cochrane systematic review, vestibular rehabilitation therapy significantly improves dizziness, balance, and quality of life in unilateral peripheral vestibular dysfunction [4].

Cawthorne-Cooksey exercise program:
- Stage 1 (supine): Eye exercises, head movements
- Stage 2 (seated): Head-eye coordination exercises, balance training
- Stage 3 (standing): Visual dependence reduction training, gait training
- Stage 4 (ambulatory): Combined gaze stabilization and gait training

Gaze stabilization exercises:
These retrain the vestibulo-ocular reflex by fixating on a stationary target against a moving background or maintaining target fixation while moving the head.

Clinical Course and Prognosis

Vestibular neuritis generally has a favorable prognosis. Central compensation develops over weeks to months after the acute phase, with symptom improvement [1].

Complete recovery of vestibular function occurs in approximately 50% of patients, while the remainder have partial recovery or persistent functional loss [3]. However, central compensation enables most patients to recover to a level that does not interfere with daily activities.

Poor prognostic factors: Advanced age, diabetes, cardiovascular disease, delayed initiation of vestibular rehabilitation.

Frequently Asked Questions

The primary suspected cause is reactivation of latent herpes simplex virus (HSV-1) infection, which triggers inflammation of the vestibular nerve. It frequently occurs after colds or influenza. Immunosuppression or extreme stress may serve as triggering factors.

Acute rotational vertigo is typically most severe during the first 1-3 days and gradually diminishes. Imbalance while walking and mild dizziness may persist for weeks to months. Consistent vestibular rehabilitation exercises help the brain compensate for vestibular function loss, promoting faster recovery.

Vestibular neuritis shows an abnormal head impulse test (positive catch-up saccades), walking is difficult but possible with support, and nystagmus beats in one direction. Stroke-related vertigo shows a normal head impulse test, walking is nearly impossible, and diplopia, hemiparesis, or speech disturbance may be present.

Some studies have shown that early methylprednisolone treatment promotes vestibular function recovery; however, the impact on long-term outcomes is limited. Randomized controlled studies have found that combination therapy with antiviral agents (valacyclovir) and corticosteroids is not more effective than corticosteroids alone.

The core components are Cawthorne-Cooksey exercises, gaze stabilization exercises, and balance training. Start with eye exercises in a supine position, progressing through sitting, standing, and walking stages. Even if dizziness is present, avoid completely avoiding movement -- continuing exercises within your ability promotes central compensation.

References

  1. [1] Strupp M, Brandt T (2009). "Vestibular neuritis." Seminars in Neurology, 29: 509-519. DOI PubMed
  2. [2] Strupp M, Zingler VC, Arbusow V, Niklas D, Maag KP, Dieterich M, Bense S, Theil D, Jahn K, Brandt T (2004). "Methylprednisolone, valacyclovir, or the combination for vestibular neuritis." New England Journal of Medicine, 351: 354-361. DOI PubMed
  3. [3] Goddard JC, Fayad JN (2011). "Vestibular neuritis." Otolaryngologic Clinics of North America, 44: 361-365. DOI PubMed
  4. [4] Hillier SL, McDonnell M (2011). "Vestibular rehabilitation for unilateral peripheral vestibular dysfunction." Cochrane Database of Systematic Reviews, 2011: CD005397. DOI PubMed
  5. [5] Newman-Toker DE, Kattah JC, Alvernia JE, Wang DZ (2008). "Normal head impulse test differentiates acute cerebellar strokes from vestibular neuritis." Neurology, 70: 2378-2385. DOI PubMed

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