Vestibular Neuritis

What Is Vestibular Neuritis?

Vestibular neuritis is an inflammatory condition affecting the vestibular nerve — the branch of the vestibulocochlear nerve (cranial nerve VIII) that carries balance information from the inner ear to the brain. When this nerve becomes inflamed, it sends abnormal or reduced balance signals to the brain, resulting in sudden and often severe vertigo. Vestibular neuritis is recognised as one of the most common causes of acute peripheral vertigo in the United Kingdom, typically affecting adults between the ages of 30 and 60, though it can occur at any age.

The condition accounts for approximately 5–10% of all vertigo presentations seen in NHS emergency departments and GP surgeries. While the experience can be frightening and debilitating in the acute phase, vestibular neuritis is generally a self-limiting condition with a good long-term prognosis. Understanding what the condition involves, how it is diagnosed, and what treatment options are available can help reduce anxiety and guide effective recovery.

Causes of Vestibular Neuritis

Vestibular neuritis is most commonly caused by a viral infection, either through direct viral invasion of the vestibular nerve or, more frequently, through a post-viral immune-mediated inflammatory response that damages the nerve. The virus most strongly implicated in research is herpes simplex virus type 1 (HSV-1) — the same virus responsible for cold sores. Post-mortem studies have found HSV-1 DNA in the vestibular ganglia of a significant proportion of the general population, suggesting that reactivation of latent virus within the nerve may trigger the inflammation.

Other viruses that have been associated with vestibular neuritis include:

• Varicella-zoster virus (the virus that causes chickenpox and shingles)
• Influenza and other respiratory viruses
• Adenovirus, parainfluenza, and cytomegalovirus

The inflammation most commonly affects the superior branch of the vestibular nerve, which supplies the horizontal and anterior semicircular canals and the utricle. The inferior branch, which supplies the posterior semicircular canal and the saccule, can also be affected, though this is less common. Importantly, vestibular neuritis affects only the balance portion of the vestibulocochlear nerve — the cochlear (hearing) portion remains intact. This is the critical distinction from labyrinthitis, which affects both the balance and hearing structures of the inner ear.

In some cases, reduced blood supply to the vestibular nerve may play a role, and there are rare associations with autoimmune conditions. However, viral or post-viral inflammation remains the most widely accepted mechanism.

Symptoms

The hallmark feature of vestibular neuritis is the sudden onset of severe rotational vertigo — a compelling sensation that the world is spinning around you, or that you are spinning within the room. This is not a feeling of light-headedness or faintness, but a true rotational illusion that can be profoundly disorienting and distressing. The vertigo typically develops over a period of minutes to hours and reaches its maximum intensity within the first 24 to 48 hours.

The full range of symptoms includes:

• Severe rotational vertigo — continuous (not episodic), present even at rest, and worsened significantly by head movement
• Nausea and vomiting — often intense during the first one to two days, sometimes severe enough to cause dehydration
• Marked unsteadiness — difficulty standing, walking, or maintaining balance, with a tendency to fall towards the affected side
• Nystagmus — involuntary, rhythmic eye movements that are typically observable during the acute episode and are an important diagnostic sign
• Difficulty focusing visually — because the eyes are being driven by abnormal vestibular signals
• No hearing loss or tinnitus — this is the key feature that distinguishes vestibular neuritis from labyrinthitis. If hearing is affected alongside vertigo, the diagnosis is more likely labyrinthitis

The vertigo in vestibular neuritis is continuous — unlike the episodic attacks seen in Meniere's disease, which come and go over hours. It is present at rest and dramatically worsened by any head movement. Many people find that lying still with their eyes closed in a darkened room provides the most relief during the acute phase.

Diagnosis

Diagnosis of vestibular neuritis is primarily clinical, based on the characteristic history of sudden-onset continuous vertigo without hearing loss, combined with specific examination findings. There is no single definitive test, but several assessments help confirm the diagnosis and — critically — rule out more serious central causes of vertigo such as stroke.

The Head Impulse Test

The head impulse test (also known as the Halmagyi test) is the single most important bedside test in the assessment of acute vertigo. The clinician holds the patient's head and asks them to focus on a target, then makes a quick, small rotation of the head to one side. In vestibular neuritis, a characteristic "catch-up saccade" — a corrective eye movement — is seen when the head is turned towards the affected side. This positive result helps confirm a peripheral (inner ear) cause of vertigo and provides reassurance that the vertigo is not due to a stroke.

Additional Investigations

• Caloric testing — warm and cool water or air are introduced into the ear canal to stimulate the vestibular system. A reduced response on the affected side confirms vestibular hypofunction.
• Videonystagmography (VNG) — sophisticated eye-tracking technology that records and analyses the pattern of nystagmus, helping to quantify the vestibular deficit.
• A hearing test — essential to confirm that hearing is normal, which supports the diagnosis of vestibular neuritis rather than labyrinthitis.
• MRI scanning — may be requested to rule out stroke or other central nervous system causes, particularly in older patients, those with vascular risk factors (high blood pressure, diabetes, smoking), or when the clinical picture is atypical.

The distinction between vestibular neuritis and stroke is critically important because posterior circulation strokes can mimic vestibular neuritis. The combination of a positive head impulse test, direction-fixed nystagmus, and absence of skew deviation — known as the HINTS examination — is used in emergency settings to differentiate the two conditions with high accuracy.

Treatment

Treatment for vestibular neuritis is divided into two phases: managing the acute symptoms and promoting long-term recovery through rehabilitation.

Acute Phase Treatment

During the first few days, treatment focuses on symptom relief:

• Vestibular suppressant medications — such as prochlorperazine (Stemetil), cyclizine, or cinnarizine — can help reduce the severity of vertigo and nausea. These work by dampening the conflicting signals from the vestibular system.
• Anti-emetic medications — such as domperidone or ondansetron — may be needed if vomiting is severe or if oral medications cannot be kept down.
• Oral corticosteroids — such as prednisolone — may be considered in the early stages to reduce nerve inflammation, though the evidence for their benefit remains mixed. Some studies have shown improved vestibular recovery with early steroid treatment, while others have found no significant advantage.
• Intravenous fluids — may be necessary if vomiting is severe enough to cause dehydration, particularly in older patients.

A critical principle: vestibular suppressant medications should be used for the shortest possible time — typically no more than 48 to 72 hours. While they provide welcome relief from the acute symptoms, prolonged use actually delays recovery by interfering with the brain's natural compensation process. Early mobilisation, even when uncomfortable, is essential for promoting recovery.

Vestibular Compensation

Recovery from vestibular neuritis relies on a remarkable process called vestibular compensation. When one vestibular nerve is damaged, the brain gradually learns to recalibrate its balance processing, relying more heavily on the intact vestibular nerve on the opposite side, together with visual input and proprioceptive signals from the muscles and joints. This compensation process begins within days of the acute episode and continues over weeks to months.

The brain's ability to compensate is enhanced by movement and activity — which is why early mobilisation and structured rehabilitation exercises are so important, even though they may initially increase dizziness.

Vestibular Rehabilitation Therapy (VRT)

Vestibular rehabilitation therapy (VRT) is the single most effective treatment for ongoing symptoms following vestibular neuritis and is recommended by NICE (the National Institute for Health and Care Excellence). VRT is a programme of specific exercises designed to promote and accelerate the brain's natural compensation for disrupted balance signals.

A typical VRT programme includes:

• Gaze stabilisation exercises — training the eyes to maintain focus during head movements, which helps reduce visual blurring and dizziness
• Balance and postural training — progressively challenging exercises that improve steadiness in standing and walking
• Habituation exercises — repeated exposure to movements and positions that provoke dizziness, gradually reducing the brain's sensitivity to these triggers
• Walking and functional activities — practising everyday movements in a structured way to build confidence

VRT is available through NHS physiotherapy services and specialist balance clinics. Your GP can refer you, or in some areas you can self-refer to NHS physiotherapy. A physiotherapist with vestibular expertise will tailor the programme to your specific symptoms and guide progression over several weeks. A balance assessment can help establish a baseline and monitor your recovery.

Recovery and Prognosis

Recovery from vestibular neuritis depends on the brain's remarkable ability to adapt through vestibular compensation — gradually recalibrating its balance processing to account for the reduced input from the damaged nerve. This process is supported by the intact vestibular nerve on the opposite side, together with visual information and proprioceptive signals from the muscles and joints. Active participation in rehabilitation exercises significantly accelerates this natural recovery process.

The recovery timeline for vestibular neuritis follows a characteristic pattern:

• Days 1–3: The most intense vertigo, nausea, and unsteadiness. Many people are unable to stand or walk without support.
• Days 3–7: Gradual improvement in severe vertigo. The constant spinning sensation begins to reduce, though head movement still provokes significant dizziness.
• Weeks 1–2: Most people can return to gentle daily activities, though they may feel unsteady and easily fatigued. Driving should be avoided until symptoms have substantially resolved.
• Weeks 2–12: Continued gradual improvement with ongoing vestibular rehabilitation. Residual unsteadiness, particularly with rapid head movements, in busy visual environments, or when fatigued, is common during this period.
• 3–6 months: Most people achieve substantial or complete recovery. Some residual imbalance may persist, particularly in demanding situations.

The overall prognosis for vestibular neuritis is generally good. The majority of people make a full functional recovery, though research suggests that approximately 30–50% may have some measurable residual vestibular hypofunction on formal testing, even when they feel well. A small proportion — estimated at around 10–15% — may experience persistent dizziness or imbalance that requires ongoing management.

Vestibular neuritis can occasionally recur, though this is uncommon — most people experience a single episode. Benign paroxysmal positional vertigo (BPPV) can develop as a sequela of vestibular neuritis in approximately 10–15% of cases, typically within the first few weeks. BPPV causes brief episodes of intense positional vertigo triggered by specific head positions (such as rolling over in bed) and is readily treatable with repositioning manoeuvres performed by a physiotherapist or GP.

It is worth noting that the sudden and dramatic nature of vestibular neuritis can have a significant psychological impact. Many people experience anxiety about the vertigo recurring, and some develop avoidance behaviours — limiting head movements, avoiding busy visual environments, or withdrawing from activities they previously enjoyed. If anxiety or low mood persist beyond the acute phase, speak to your GP about psychological support. Understanding that vestibular neuritis is a one-off event for the vast majority of people, and that effective rehabilitation is available through the NHS, can provide reassurance during recovery.

When to Seek Emergency Help

While vestibular neuritis is not dangerous, it is essential to rule out more serious conditions — particularly stroke — that can present with similar symptoms. Seek emergency medical attention (call 999) if sudden vertigo is accompanied by:

• Severe headache — particularly a sudden, unusually intense headache
• Double vision or visual loss
• Facial weakness or numbness
• Slurred speech or difficulty understanding speech
• Difficulty swallowing
• Weakness or numbness in an arm or leg
• Loss of consciousness

See your GP promptly if vertigo is persistent, if you are unable to keep fluids down, or if balance problems continue beyond two to three weeks without improvement. Your GP can refer you for vestibular assessment, VRT through NHS physiotherapy, or specialist balance clinic review. If you are unsure whether your symptoms represent vestibular neuritis or another condition, a search for audiologists and balance specialists near you can help you find appropriate local services.