Zoster Vestibular Neuritis

What is Zoster vestibular neuritis?

Zoster vestibular neuritis (ZVN) is an inflammation of the vestibular portion of the eighth cranial nerve (the vestibulocochlear nerve) caused by reactivation of the varicella‑zoster virus (VZV), the same virus that produces chicken‑pox and shingles. When VZV reactivates in the geniculate ganglion, it can spread to the vestibular nerve, leading to sudden vertigo, imbalance, and sometimes hearing changes. Unlike classic vestibular neuritis, which is usually viral (often presumed to be an unidentified herpesvirus) and does not involve a rash, ZVN often accompanies cutaneous shingles (herpes zoster oticus) or a vesicular rash in the ear canal or on the pinna.

Because the vestibular system controls balance, inflammation can cause debilitating dizziness that may last days to weeks. Early recognition is essential, as antiviral therapy can limit nerve damage and improve recovery.

Sources: Mayo Clinic; National Institute of Neurological Disorders and Stroke (NINDS); Cleveland Clinic.

Common Causes

While the term “zoster vestibular neuritis” specifically refers to VZV reactivation, several conditions can produce similar vestibular inflammation. Understanding these helps clinicians differentiate ZVN from other causes.

• Varicella‑zoster virus reactivation (herpes zoster oticus or Ramsay Hunt syndrome type 2)
• Other herpesviruses (HSV‑1, HSV‑2) – can cause idiopathic vestibular neuritis.
• Ischemic injury to the vestibular nerve – often seen in patients with uncontrolled hypertension or atherosclerosis.
• Autoimmune inner ear disease – antibodies attack inner‑ear structures.
• Traumatic head injury – can damage the vestibular nerve or labyrinth.
• Ototoxic medications – high‑dose aminoglycosides, loop diuretics, certain chemotherapy agents.
• Middle‑ear infections (otitis media) that spread to the inner ear
• Acoustic neuroma (vestibular schwannoma) – a benign tumor that compresses the vestibular nerve.
• Meniere’s disease – though primarily a cochlear disorder, it can coexist with vestibular neuritis.
• Multiple sclerosis – demyelinating plaques may involve the vestibular nerve.

Associated Symptoms

Patients with ZVN often present with a combination of vestibular and, occasionally, auditory findings.

• Sudden, severe vertigo – a spinning sensation that can last minutes to several days.
• Nausea and vomiting – triggered by the intense dizziness.
• Unsteady gait or difficulty walking – especially in low‑light conditions.
• Unilateral hearing loss – may be mild to moderate; more common if the cochlear nerve is also involved.
• Tinnitus (ringing in the ear)
• Ears’ skin rash or vesicles – classic “shingles” lesions in the external auditory canal, pinna, or behind the ear.
• Facial weakness or paralysis – if the facial nerve is also affected (Ramsay Hunt syndrome type 2).
• Ear fullness or pressure
• Photophobia or phonophobia – sensitivity to light and sound due to vestibular overload.

Symptoms typically peak within 24‑48 hours and gradually improve over weeks, but residual imbalance can persist for months if treatment is delayed.

When to See a Doctor

Because vertigo can stem from many serious conditions, timely medical evaluation is crucial. Seek professional care if you experience any of the following:

• Vertigo lasting longer than 24 hours or worsening over time.
• Sudden onset of facial droop, ear pain with vesicular rash, or hearing loss.
• Severe vomiting that prevents keeping fluids down.
• Double vision, difficulty speaking, or slurred speech.
• Persistent headache, especially if it’s the “worst ever” or accompanied by neck stiffness.
• History of immunosuppression (e.g., chemotherapy, HIV, organ transplant) – infections can spread more aggressively.
• Any new neurological deficit (weakness, numbness, confusion).

Diagnosis

Diagnosing ZVN involves a combination of clinical evaluation, targeted examinations, and selective testing.

1. Clinical History & Physical Exam

• Onset, duration, and triggers of vertigo.
• Presence of a vesicular rash or recent shingles.
• Assessment of hearing (whisper test, tuning fork) and facial nerve function.
• Bedside vestibular tests – Dix‑Hallpike maneuver for positional vertigo, head‑impulse test for vestibular hypofunction.

2. Otoscopic Examination

Look for vesicles or erythema in the external auditory canal, a hallmark of VZV reactivation.

3. Audiometry

Pure‑tone audiometry helps quantify any co‑existing hearing loss.

4. Vestibular Function Tests

• Electronystagmography (ENG) or Video‑Nystagmography (VNG) – records eye movements to detect vestibular asymmetry.
• Rotational chair testing – assesses bilateral vestibular response.
• Vestibular‑evoked myogenic potentials (VEMP) – evaluates saccular and inferior vestibular nerve function.

5. Imaging

Magnetic resonance imaging (MRI) with gadolinium is ordered when:

• There is suspicion of central causes (stroke, tumor).
• Symptoms are atypical or prolonged beyond 4 weeks.
• Facial nerve involvement suggests Ramsay Hunt syndrome.

MRI can show enhancement of the vestibular nerve consistent with inflammation.

6. Laboratory Tests

• Polymerase chain reaction (PCR) of vesicular fluid for VZV DNA (highly specific).
• Serum VZV IgM/IgG titers – supportive but less definitive.

Treatment Options

Management combines antiviral medication, anti‑inflammatory therapy, vestibular rehabilitation, and symptom‑control measures.

1. Antiviral Therapy

• Acyclovir 800 mg five times daily for 7‑10 days, or Valacyclovir 1 g three times daily for the same duration.
• Early initiation (within 72 hours of rash onset) improves outcomes and reduces long‑term vestibular deficits.

2. Corticosteroids

Oral prednisone 1 mg/kg/day (max 60 mg) for 5‑7 days, then taper over 1‑2 weeks, may reduce nerve inflammation and hasten recovery. The combination of antivirals and steroids is recommended for most patients with ZVN.

3. Symptom Relief

• Antiemetics – ondansetron 4‑8 mg IV/PO every 8 hours.
• Vestibular suppressants – short‑course meclizine 25‑50 mg PO every 6 hours (avoid prolonged use as it may delay central compensation).
• Analgesics – acetaminophen or ibuprofen for associated headache or ear pain.

4. Vestibular Rehabilitation Therapy (VRT)

Once acute vertigo subsides, a structured program of balance and gaze‑stability exercises (e.g., gaze‑stabilization, habituation, balance training) is essential for functional recovery. A physical therapist specialized in vestibular disorders should supervise the program.

5. Hearing Support

• If significant hearing loss persists, consider a short course of oral steroids for cochlear protection.
• Hearing aids or assistive listening devices may be indicated for lasting deficits.

6. Follow‑up Care

Patients should be re‑evaluated 1–2 weeks after starting therapy to assess response, adjust medication, and begin VRT. Persistent imbalance beyond 3 months warrants repeat imaging and possible referral to a neuro‑otology specialist.

Prevention Tips

Because ZVN is linked to VZV reactivation, preventive strategies focus on reducing shingles risk and maintaining overall vestibular health.

• Get the shingles vaccine (Shingrix) – recommended for adults ≥50 years and immunocompromised patients; reduces incidence and severity of shingles by >90 % (CDC).
• Maintain a healthy immune system – balanced diet, regular exercise, adequate sleep, and stress management.
• Avoid smoking and excessive alcohol – both impair immune function and increase vascular risk.
• Control chronic conditions – manage diabetes, hypertension, and hyperlipidemia to lower ischemic risk to the vestibular nerve.
• Prompt treatment of ear infections – early antibiotics for bacterial otitis media may prevent spread to the inner ear.
• Limit ototoxic drug exposure – use the lowest effective dose and monitor hearing when using aminoglycosides or loop diuretics.
• Protect ears from trauma – wear appropriate protection during loud activities or sports.

Emergency Warning Signs

If any of the following occur, seek emergency care (ER or call 911) immediately.

• Sudden, severe vertigo with a new stroke‑like picture – facial droop, arm weakness, slurred speech, or inability to walk.
• Rapidly progressive hearing loss with persistent vomiting despite medication.
• High fever (>38.5 °C / 101.3 °F) combined with a rash that spreads beyond the ear region.
• Signs of meningitis – stiff neck, photophobia, severe headache, altered mental status.
• Loss of consciousness or seizures.
• Severe otalgia (ear pain) with drainage that is foul‑smelling, indicating possible bacterial superinfection.

Early intervention can prevent permanent vestibular damage and reduce the risk of long‑term disability.

---

References:

1. Mayo Clinic. “Vestibular neuritis.” Updated 2023. https://www.mayoclinic.org
2. CDC. “Shingles (Herpes Zoster) Vaccination.” 2024. https://www.cdc.gov
3. National Institute of Neurological Disorders and Stroke. “Ramsay Hunt Syndrome.” 2022. https://www.ninds.nih.gov
4. Cleveland Clinic. “Vertigo – Causes and Treatment.” 2023. https://my.clevelandclinic.org
5. World Health Organization. “Varicella‑zoster virus.” 2023. https://www.who.int