What Is Vestibular Neuritis?

Vestibular neuritis is an inflammation of the vestibular nerve — the nerve responsible for carrying balance information from the inner ear to the brain. When this nerve becomes inflamed, the signals it sends are disrupted, producing a sudden and often severe onset of vertigo, imbalance, and nausea that can be among the most frightening experiences a person has ever had.

It is one of the most common causes of acute, severe vertigo — and one of the most commonly misdiagnosed. Many people who experience vestibular neuritis are initially told they have a virus, inner ear infection, or in some cases are sent for cardiac or neurological investigation before the correct diagnosis is reached.

• Affects the vestibular nerve on one side only

• Hearing is not affected — this is what distinguishes it from labyrinthitis

• Typically follows a viral illness — though the virus is rarely identified

• Most people recover significantly — but without rehabilitation, recovery can be slow and incomplete

What Causes It?

The exact mechanism behind vestibular neuritis is not fully understood, but it is widely believed to be caused by a viral infection — or the immune response to one — that triggers inflammation of the vestibular nerve.

Viral infection The most commonly implicated virus is herpes simplex virus type 1 (HSV-1) — the same virus responsible for cold sores. It is thought that the virus, which can lie dormant in the vestibular nerve ganglia, reactivates and triggers inflammation. Other viruses — including those responsible for upper respiratory tract infections — have also been implicated.

Post-viral immune response In some cases, vestibular neuritis may represent an immune-mediated response to a recent viral illness rather than direct viral damage — similar to the mechanism behind some other post-viral conditions.

Why the vestibular nerve? The vestibular nerve — and in particular the superior division, which supplies most of the semicircular canals — appears to be particularly vulnerable to viral reactivation, possibly due to its anatomy and the way the nerve passes through a narrow bony canal.

Symptoms

Vestibular neuritis has a characteristic presentation that sets it apart from most other causes of dizziness. Understanding the typical symptom pattern is important — both for diagnosis and for understanding what to expect during recovery.

1. Sudden Onset Severe Vertigo

• The defining feature of vestibular neuritis

• Onset is typically sudden and without warning — often described as the worst dizziness the person has ever experienced

• A violent, spinning sensation that may be so severe it is impossible to stand or walk

• Often begins on waking, or during normal daily activity with no obvious trigger

• Not triggered by head position changes — this is what distinguishes it from BPPV

2. Nausea and Vomiting

• Almost universally present in the acute phase

• Can be severe — many people are unable to keep fluids down in the first 24 to 48 hours

• Driven by the conflict between the disrupted vestibular signals and what the eyes and body are sensing

3. Spontaneous Nystagmus

• Involuntary, rhythmic flickering of the eyes toward the healthy side

• Present in the acute phase and visible to a trained clinician

• One of the most reliable clinical signs of acute vestibular neuritis

• Gradually resolves as the brain begins to compensate

4. Imbalance and Unsteadiness

• Severe in the acute phase — walking unaided may be impossible

• A tendency to fall or veer toward the affected side

• Gradually improves as central compensation develops

• Residual unsteadiness — particularly during head movement or in low light — may persist for months without rehabilitation

5. Normal Hearing

• Hearing is not affected in vestibular neuritis

• This is one of the key features that distinguishes it from labyrinthitis, in which both the vestibular nerve and cochlea are involved

• If hearing loss is present alongside acute vertigo, a different diagnosis should be considered

6. No Neurological Symptoms

• Vestibular neuritis does not cause weakness, numbness, double vision, facial drooping, or difficulty speaking

• The presence of any of these symptoms alongside acute vertigo should prompt urgent neurological investigation to rule out stroke or other central cause

Is It a Stroke?

One of the most important questions in the acute assessment of vestibular neuritis is whether the symptoms could represent a stroke or TIA affecting the brainstem or cerebellum — both of which can produce sudden severe vertigo that is clinically similar to vestibular neuritis.

The following features suggest a central cause rather than vestibular neuritis and should prompt urgent medical assessment:

• Vertigo accompanied by double vision, slurred speech, facial drooping, weakness, or numbness

• Direction-changing nystagmus — eye movement that reverses direction depending on gaze

• Inability to walk even with support — truncal ataxia

• Sudden severe headache accompanying the vertigo

• New onset in someone over 60 with cardiovascular risk factors — hypertension, diabetes, atrial fibrillation, or a history of stroke

If you are unsure, always err on the side of caution and seek urgent medical attention. Vestibular neuritis is not dangerous — a posterior circulation stroke is.

The Typical Recovery Pattern

Recovery from vestibular neuritis follows a broadly predictable course — though the timeline varies considerably between individuals depending on the severity of the initial nerve damage and the quality of rehabilitation received.

Acute Phase (Days 1–5)

• Severe constant vertigo, nausea, and vomiting

• Unable to stand or walk unaided

• Spontaneous nystagmus clearly visible

• Complete rest is unavoidable during this phase — but should not be prolonged beyond what is necessary

Early Recovery Phase (Days 5–21)

• Gradual reduction in constant vertigo as the brain begins to compensate

• Able to move around with support, though head movement remains provocative

• Nausea subsides

• Fatigue is significant

• Vestibular rehabilitation should begin as soon as tolerated during this phase

Compensation Phase (Weeks 3–12)

• The brain recalibrates, learning to interpret the asymmetric vestibular signals

• Most people achieve significant functional improvement during this period

• Head movement sensitivity gradually reduces with targeted rehabilitation

• Many people return to work and normal activities — though symptoms may still be present during demanding tasks

Long-Term Recovery (3 Months Onwards)

• Most people with vestibular neuritis achieve good functional recovery within three to six months

• A proportion — particularly those who do not undertake rehabilitation — are left with residual symptoms including unsteadiness in low light, sensitivity to head movement, and fatigue

• Decompensation — a temporary return of symptoms — can occur during illness, stress, or periods of inactivity

• Full vestibular function does not always return — but the brain's compensatory mechanisms can be highly effective when properly developed

How Is It Diagnosed?

Vestibular neuritis is primarily a clinical diagnosis — based on the characteristic symptom pattern and the findings of specialist vestibular testing. There is no single definitive test, but a combination of the following provides a reliable picture:

1. Detailed Case History The sudden onset, the severity of the vertigo, the absence of hearing loss, and the absence of neurological symptoms are the most important diagnostic features. A thorough case history is the cornerstone of diagnosis.

2. HINTS Examination A test used in the acute phase to distinguish vestibular neuritis from a central cause such as stroke. Stands for Head Impulse, Nystagmus, Test of Skew — and in experienced hands is highly sensitive for identifying central pathology.

3. vHIT — Video Head Impulse Test One of the most informative objective tests for vestibular neuritis. Measures the vestibulo-ocular reflex in each ear separately. A reduced or absent response on the affected side confirms unilateral vestibular hypofunction consistent with vestibular neuritis — and helps quantify the degree of deficit.

4. VNG — Videonystagmography Records spontaneous and provoked eye movements in detail. The pattern of nystagmus in vestibular neuritis is characteristic — beating away from the affected side — and helps confirm the diagnosis and identify which ear is involved.

5. VEMP Testing Assesses the otolith organs on each side. In vestibular neuritis involving the superior division of the vestibular nerve, cVEMP responses are typically normal while oVEMP responses may be reduced on the affected side — helping to characterise the extent of nerve involvement.

6. Audiometry A hearing assessment is performed to confirm that hearing is normal — ruling out labyrinthitis and other conditions that affect both hearing and balance.

Treatment and Management

1. Acute Phase — Symptomatic Relief

In the first few days, the priority is managing the severity of symptoms:

• Vestibular suppressants — such as prochlorperazine (Stemetil) — can reduce the severity of vertigo and nausea in the acute phase. Important: these medications should be stopped as soon as symptoms are manageable — typically within 3 to 5 days. Prolonged use suppresses the brain processes needed for compensation and slows recovery significantly

• Antiemetics — to manage nausea and vomiting and maintain hydration

• Rest — unavoidable in the first few days, but should not be prolonged. Getting moving as soon as tolerated is important for triggering the brain's compensatory mechanisms

2. Vestibular Rehabilitation — The Most Important Treatment

Vestibular rehabilitation is the single most important intervention for recovery from vestibular neuritis. It is a specialist exercise-based therapy that promotes central compensation — the brain's ability to adapt to and work around the reduced vestibular input from the affected side.

A well-designed rehabilitation programme for vestibular neuritis includes:

• Gaze stabilisation exercises — training the eyes to maintain focus during head movement, directly targeting the VOR deficit and reducing oscillopsia

• Balance retraining — progressively challenging exercises that improve stability across a range of conditions and surfaces

• Habituation exercises — controlled, repeated exposure to movements that provoke symptoms, reducing the dizziness response over time

• Gradual return to activity — systematically reintroducing avoided movements and environments, building confidence and reducing anxiety-driven avoidance

Rehabilitation should begin as early as tolerated — ideally within the first two to three weeks — and be progressed systematically based on response. Early, active rehabilitation consistently produces better outcomes than rest alone.

3. Managing Decompensation

Decompensation — a temporary return of vestibular symptoms — is a common and often alarming experience during recovery. It typically occurs during:

• A viral illness or upper respiratory tract infection

• A period of stress or significant fatigue

• Prolonged inactivity or bed rest

• A sudden change in environment or physical demands

Decompensation is not a sign that recovery has been lost — it is a temporary setback that typically resolves quickly with a return to activity and rehabilitation exercises. Understanding this in advance significantly reduces anxiety when it occurs.

4. Onward Referral

Where the diagnosis is uncertain, where symptoms are not following the expected recovery pattern, or where a central cause cannot be confidently excluded, referral to a neurologist or ENT specialist is appropriate.

Living With Vestibular Neuritis

The acute phase of vestibular neuritis is frightening and debilitating — and even as recovery progresses, the residual symptoms can significantly affect quality of life. Fatigue, difficulty in busy environments, and anxiety about symptom recurrence are all common experiences.

Practical strategies during recovery:

• Stay active — inactivity is one of the biggest barriers to compensation. Gentle movement, even when it provokes mild symptoms, is beneficial

• Persist with rehabilitation exercises — they work, but they take time and consistency

• Expect good days and bad days — recovery is rarely linear. A bad day does not mean you are going backwards

• Reduce caffeine and alcohol — both can worsen vestibular symptoms during recovery

• Prioritise sleep — fatigue significantly worsens dizziness and slows the brain's ability to compensate

• Be open with those around you — vestibular neuritis is invisible to others and can be difficult to understand from the outside. Explaining what you are experiencing can make a significant difference to the support you receive

• Seek help for anxiety — if anxiety or low mood develops alongside your physical symptoms, addressing it directly — through psychological support or vestibular rehabilitation — is an important part of recovery

Final Thoughts

Vestibular neuritis is one of the most acutely distressing vestibular conditions — but it is also one from which most people make a meaningful, and in many cases full, recovery. The brain's capacity to compensate for a sudden loss of vestibular input on one side is remarkable — but it needs the right conditions, the right challenge, and the right support to do so effectively.

If you have been diagnosed with vestibular neuritis, or if you are experiencing symptoms that match the pattern described on this page, specialist assessment and early rehabilitation are the most important steps you can take.