Labyrinthitis (inflammation of the inner ear)

Labyrinthitis is an inflammation of the inner ear, affecting the labyrinth structures responsible for hearing and balance. Typical symptoms include sudden, intense rotational vertigo, nausea, imbalance, tinnitus, and hearing loss on the affected side. Unlike isolated inflammation of the vestibulocochlear nerve, labyrinthitis typically presents with both vestibular and auditory symptoms. It is important to distinguish this condition from a stroke involving the brainstem and cerebellum, as the clinical presentation can be similar. [1]

Labyrinthitis is most often caused by viral respiratory infections and bacterial complications of otitis media, and less commonly by meningitis, trauma, autoimmune processes, or toxic damage to the inner ear. In the post-antibiotic era, purulent forms are less common, but the risk remains with chronic purulent otitis media and cholesteatoma. Misinterpretation of symptoms and delayed treatment increase the likelihood of permanent hearing loss and long-term balance impairment. [2]

When viral in origin, the process is limited to serous inflammation, while when bacterial, it can spread to the cochlea and vestibule, resulting in pus, fibrosis, and even ossification of the labyrinth. Bacterial forms are more likely to lead to irreversible sensorineural hearing loss and require systemic antibacterial therapy and sanitation of the middle ear lesion. [3]

The physician's task is to quickly assess dangerous signs, confirm the peripheral nature of dizziness, rule out stroke, and prescribe etiotropic and symptomatic treatment, followed by early vestibular rehabilitation to accelerate compensation. This step-by-step approach reduces the risk of protracted progression and disability. [4]

Code according to ICD-10 and ICD-11

In the International Classification of Diseases, Tenth Revision, labyrinthitis is classified as a disease of the inner ear, code H83.0. This code applies to serous and purulent forms and is used for statistical and insurance reporting. If concomitant otitis media and meningitis are present, the corresponding codes for the underlying process are added. [5]

In the International Classification of Diseases, Eleventh Revision, labyrinthitis is included in the section on diseases of the inner ear as a separate item with the code AB30.1. The structure of the section emphasizes the classification of labyrinthitis as an acute vestibular syndrome, which is useful for clinical routing. [6]

Table 1. ICD-10 and ICD-11 codes for labyrinthitis

Classifier	Chapter	Code	Name
ICD-10	Diseases of the inner ear	H83.0	Labyrinthitis
ICD-11	Diseases of the inner ear	AB30.1	Labyrinthitis

[7]

Epidemiology

While there are few comprehensive population estimates of labyrinthitis, it is known that its incidence increases with age and is more commonly diagnosed in middle-aged and older adults. Viral forms are considered the most common, while purulent forms are significantly less common due to the widespread use of antibiotics for otitis media. [8]

Data on a closely related condition, vestibular neuritis, which clinically overlaps with labyrinthitis, show an annual incidence of 3.5 to 15.5 per 100,000 population. This allows us to roughly estimate the frequency of acute peripheral vestibular syndromes in the population. [9]

Large administrative studies indicate that peripheral vestibular disorders are common, with hundreds of cases per 100,000 population per year, with slightly higher rates in women. These figures include a variety of diagnoses, including benign positional vertigo and Ménière's disease, and reflect the burden on the healthcare system. [10]

Some clinical series highlight that with sudden sensorineural hearing loss, up to 40% of patients report severe dizziness or unsteadiness, which may be consistent with viral labyrinthitis. This is important to consider when selecting patients for urgent audiological evaluation. [11]

Reasons

Viral upper respiratory tract infections lead to serous inflammation of the labyrinth via immune and neurogenic mechanisms. Herpes viruses, influenza viruses, and other respiratory agents are often implicated. Such episodes are typically self-limited, but in the acute phase they can cause severe vestibular syndrome. [12]

Bacterial labyrinthitis most often develops against the background of acute or chronic otitis media, especially in the presence of cholesteatoma, or when infection spreads from the cranial cavity during meningitis. In these situations, promptly initiated antibacterial therapy for otitis media reduces the risk of complications. [13]

Toxic damage to the inner ear is possible with ototoxic medications, especially aminoglycosides, which damage the hair cells of the cochlea and vestibular system. The risk increases with concomitant inflammation and systemic factors, and the consequences are often irreversible. [14]

Rare causes include autoimmune processes of the inner ear, trauma, postoperative conditions, and congenital anomalies. These cases require multidisciplinary management involving an otolaryngologist and a rheumatologist or neurosurgeon, depending on the cause. [15]

Risk factors

The risk of bacterial labyrinthitis is increased in untreated acute otitis media, chronic otitis media with perforation or cholesteatoma, and recent meningitis. Under these conditions, bacteria gain access to the labyrinthine windows and can cause purulent inflammation. [16]

Systemic factors such as immunodeficiency, diabetes, advanced age, and severe viral infections increase the likelihood of a complicated course and slow compensation. These groups require earlier monitoring and a low threshold for referral to a specialist. [17]

The use of ototoxic drugs, particularly aminoglycosides, is associated with damage to both auditory and vestibular function. The severity of toxicity depends on the dose, duration, and combination with inflammatory processes. [18]

Repeated viral infections, prolonged otitis media, and delays in initiating therapy increase the risk of long-term symptoms and permanent sequelae, including sensorineural hearing loss and chronic instability.[19]

Pathogenesis

The viral process causes serous inflammation with impaired permeability of the blood-labyrinth barrier, swelling, and dysfunction of hair cells and neurons, causing acute vestibular syndrome and hearing loss. These changes are usually reversible with timely supportive therapy. [20]

In bacterial labyrinthitis, inflammation leads to fibrosis and, in severe cases, ossification of the labyrinthine space—a condition known as labyrinthitis ossification. This leads to profound, persistent sensorineural hearing loss and can complicate subsequent hearing aid treatment. [21]

Ototoxic agents, primarily aminoglycosides, induce hair cell death through oxidative stress and other programmed cell death mechanisms. Drug accumulation in the endolymph makes the damage persistent and difficult to reverse. [22]

Chronic otitis media and cholesteatoma can create perilymphatic fistulas and pathways for toxins and microbes to enter the labyrinth, increasing damage and the risk of complications, including intracranial ones.[23]

Symptoms

Labyrinthitis is characterized by a sudden, intense spinning sensation, aggravated by head movements, accompanied by nausea and vomiting, impaired balance, and an inability to stand or walk without support. Horizontal nystagmus and a pronounced autonomic response are usually present. [24]

The key difference from isolated inflammation of the vestibulocochlear nerve is the presence of hearing loss and tinnitus in the ear on the affected side. With viral hearing loss, hearing loss is often moderate and reversible, while with bacterial hearing loss, the risk of irreversible loss is higher. [25]

Symptoms are most severe in the first few days and then gradually subside, but residual instability and increased sensitivity to head movements may persist for weeks or months without rehabilitation. [26]

If fever, severe ear pain, purulent discharge from the ear, severe headache, double vision, weakness in the limbs, speech or coordination impairment occur, it is necessary to immediately exclude central causes, primarily stroke and intracranial complications. [27]

Classification, forms and stages

Clinically, a distinction is made between serous labyrinthitis, most often viral in origin, and purulent labyrinthitis, associated with a bacterial infection. The serous variant is usually milder and more often results in recovery, while the purulent variant carries a high risk of irreversible consequences. [28]

Based on the route of spread, a distinction is made between tympanogenic labyrinthitis, which occurs in complications of otitis media, and meningeal labyrinthitis, which occurs when the process spreads from the meninges. Traumatic and postoperative variants are possible if the inner ear structures are damaged. [29]

A late outcome of severe bacterial inflammation is labyrinthitis ossification—the replacement of the soft tissues of the labyrinth with bone, leading to profound hearing loss. Identifying this process using imaging data is important for planning auditory reconstruction. [30]

A related condition worth mentioning separately is isolated inflammation of the vestibulocochlear nerve, which typically does not impair hearing. In practice, distinguishing between these conditions can be difficult in the first hours and days, so a combination of clinical, audiometric, and dynamic assessment is used. [31]

Table 2. Main clinical forms of labyrinthitis

Form	Typical reasons	Hearing	Risks of consequences
Serous	Viral infections	Often a moderate temporary reduction	Low with timely rehabilitation
Purulent	Acute and chronic otitis media, cholesteatoma, meningitis	Often severe sensorineural loss	High risk of irreversible damage
Meningitis	Bacterial meningitis	Often a profound loss	High risk of labyrinth ossification
Traumatic	Trauma, ear surgery	Variable	Depends on the extent of damage

[32]

Complications and consequences

The main complication is persistent sensorineural hearing loss, sometimes profound, especially if the condition is bacterial in origin and treatment is delayed. This significantly impacts quality of life and communication. [33]

Labyrinthitis ossification develops within weeks to months following severe inflammation, most often meningitis, and complicates cochlear implantation. Early diagnosis and surgical planning increase the chances of hearing restoration in such patients. [34]

Chronic instability, fear of falling, and anxiety disorders are common without targeted rehabilitation. Individualized gaze adaptation and stabilization exercises reduce symptoms and improve daily functioning. [35]

In the case of a middle ear source of infection, mastoiditis, intracranial complications and damage to the facial nerve are possible, which requires timely antibacterial therapy and, if necessary, surgical debridement. [36]

When to see a doctor

Immediately – for sudden hearing loss, unilateral tinnitus, and ear fullness combined with dizziness. In such situations, urgent audiometry is recommended within the next few days to confirm sensorineural hearing loss and determine treatment. [37]

Immediately - if signs of central damage are present: weakness in the limbs, facial asymmetry, speech impairment, double vision, severe headache, impaired coordination. These symptoms require ruling out a stroke. [38]

Urgent treatment is indicated for fever, severe ear pain, purulent discharge, pain behind the ear, or head injury, especially in children and the elderly. This may indicate a bacterial cause and the risk of complications. [39]

Planned, but without delay - if unsteadiness, "brain fog," and movement intolerance persist after 2-3 weeks, vestibular rehabilitation is indicated. [40]

Diagnostics

1. Complaints and examination. The doctor determines the onset, duration, and trigger of dizziness, as well as the presence of hearing loss, ear pain, fever, and neurological symptoms. An otoscopy is performed, along with an assessment of nystagmus, coordination, and gait. [41]
2. Bed tests to differentiate peripheral and central stroke. A combination of head impulse testing, nystagmus pattern analysis, and vertical eye deviation testing helps suspect stroke with atypical findings and direct patients to urgent neuroimaging. Research shows that this battery of tests is superior to early magnetic resonance imaging in sensitivity during the first 24 hours of stroke. [42]
3. Audiological examination. In cases of sudden hearing loss, pure-tone audiometry is recommended as soon as possible, preferably within 14 days of symptom onset, with re-evaluation following treatment. This influences the choice of management, including the possibility of topical steroid therapy. [43]
4. Instrumental methods as indicated. Magnetic resonance imaging of the brain and inner ear with contrast is used if a central cause, neurinoma, or abscess is suspected, as well as to detect inflammatory signal enhancement in the labyrinth; high-resolution computed tomography of the temporal bones is useful if complications of otitis media and bone defects are suspected. Balance tests, including videonystagmography and caloric testing, are used to quantify the deficit and plan rehabilitation. [44]

Table 3. What, when and why is prescribed for labyrinthitis

Step	Method	For what	When especially needed
1	Examination and neurological tests	Distinguish between peripheral and central nature	Always in case of acute dizziness
2	Combined bedside oculomotor tests	Rule out stroke with "atypical" symptoms	If there is any doubt about the peripheral nature
3	Audiometry	Confirm sensorineural loss	For complaints of hearing loss and tinnitus
4	Magnetic resonance imaging and computed tomography	Identify complications and underlying causes	In case of alarming signs or severe course of the disease
5	Vestibular testing	Assess the deficit and select exercises	For persistent symptoms

[45]

Differential diagnosis

Benign positional vertigo occurs in brief, second-long attacks induced by head movements, without hearing loss or systemic symptoms; it is confirmed by positional tests and treated with repositioning maneuvers. [46]

Meniere's disease presents with recurrent attacks of fluctuating hearing loss, tinnitus, and fullness in the ear, often with dietary and stress triggers, and requires a different symptom control strategy.[47]

Vestibular migraine mimics peripheral vertigo but is associated with migraine-like symptoms, photophobia, and phonophobia; episodes can last from minutes to hours, often with normal otoscopic and neurological status.[48]

A posterior fossa stroke can masquerade as a peripheral syndrome; new neurological deficits, gaze paresis, vertical nystagmus, and pronounced instability with relatively normal functioning are alarming. Urgent imaging and observation are the priority here. [49]

Table 4. Differences between labyrinthitis and related conditions

State	Duration of the attack	Hearing	Key Tips
Labyrinthitis	Hours and days with gradual improvement	Often reduced	Viral or otogenic history
Isolated inflammation of the vestibulocochlear nerve	Hours and days	Usually saved	No hearing loss
Benign positional vertigo	Seconds	Saved	Provocation by head position
Meniere's disease	Minutes and hours	Fluctuates	Fullness in the ear and noise
Cerebellar stroke	Constantly	Variable	Focal neurological signs

[50]

Treatment

The primary goals in the first few days are to reduce the severity of dizziness and nausea, ensure rehydration and sleep, and begin gentle activity with gradual mobilization as early as possible. Short-term use of antiemetics and vestibular sedatives is acceptable, but they should be discontinued after 2-3 days to avoid inhibiting central compensation. [51]

For viral, or serous, dizziness, there are no etiotropic antiviral agents with proven benefit. Early vestibular rehabilitation plays a key role: individually tailored exercises for gaze stabilization, adaptation, and habituation accelerate balance restoration and reduce dizziness. The evidence base includes systematic reviews and randomized trials. [52]

In the presence of sudden sensorineural hearing loss, a regimen with timely systemic or local steroid therapy, as recommended by the relevant guidelines, is advisable: early audiometry, discussion of systemic glucocorticoids, and, if the response is incomplete, consideration of intratympanic steroid administration after 2-6 weeks. This tactic is aimed at preserving hearing. [53]

For cases consistent with isolated vestibulocochlear nerve inflammation, early systemic methylprednisolone has been shown to be beneficial, while the addition of an antiviral drug in the study did not improve outcomes. This is important in borderline cases, where hearing loss is mild or normal, but vestibular deficits are severe. [54]

For bacterial, or purulent, labyrinthitis, the basis of treatment is timely systemic antibacterial therapy, targeting the central nervous system and sanitation of the primary lesion in the middle ear. In severe cases, intravenous beta-lactam antibiotics are used, sometimes in combination, with adjustments based on culture results. In case of complications, myringotomy and placement of a ventilation tube are indicated, and in the case of mastoiditis, surgical intervention is necessary. [55]

During the acute phase, it is important to avoid prolonged bed rest: early mobilization and daily activities promote compensation. As the severity of the attack subsides, the patient transitions to a structured exercise program, sometimes using virtual or telerehabilitation technologies, which have shown comparable effectiveness. [56]

Vestibular exercises are individually tailored: gaze stabilization, movement adaptation exercises, and balance training with gradual progression. The program includes home exercises and specialist monitoring every 1-2 weeks until functional goals are achieved. Meta-analyses confirm a clinically significant reduction in dizziness and improvement in balance. [57]

For autoimmune processes of the inner ear, glucocorticoids and other immunomodulators are used as prescribed by a specialist. This can stabilize hearing and reduce the severity of the process. Early diagnosis and exclusion of an infectious cause before initiating immunosuppression remain crucial. [58]

Controlling risk factors—prompt treatment of otitis media, limiting ototoxic medications, and adhering to vaccination schedules—reduces the likelihood of severe outcomes. Vaccination against Haemophilus influenzae type b and pneumococcus has been shown to reduce the incidence of invasive infections and their complications, including meningitis, which can lead to severe labyrinthitis. [59]

Table 5. Treatment depending on the cause

Situation	First line	Alternatives and additions	Target
Viral serous process	A short course of antiemetics and sedatives for 2-3 days, early mobilization	Individual vestibular rehabilitation	Fast compensation
Sudden sensorineural hearing loss	Early audiometry, discussion of systemic steroids	Intratympanic steroids for incomplete response	Hearing preservation
Purulent labyrinthitis	Intravenous antibiotics with penetration into the central nervous system, sanitation of the middle ear	Myringotomy, ventilation tube, surgery in case of complications	Infection control and prevention of complications
Autoimmune process	Glucocorticoids	Immunomodulators according to indications	Process activity monitoring

[60]

Prevention

Timely diagnosis and treatment of acute otitis media, especially in children, reduce the risk of infection progressing to the inner ear. Strategies include appropriate antibiotic therapy when indicated and specialist monitoring if the condition persists. [61]

Vaccination against Haemophilus influenzae type b has significantly reduced the incidence of meningitis and associated hearing loss. Pneumococcal conjugate vaccines have also reduced the incidence of invasive infections and severe respiratory and ear complications. [62]

Caution with ototoxic drugs, especially aminoglycosides, and monitoring the dose and duration of treatment courses reduce the likelihood of permanent damage to the cochlear hair cells and vestibular apparatus. When possible, less ototoxic alternatives are chosen. [63]

Maintaining physical activity and balance training in individuals with increased sensitivity to head movement helps speed up compensation during recurrent episodes and reduces fear of falls. [64]

Forecast

In viral serous processes, most patients improve within weeks, although residual instability may persist for months without targeted rehabilitation. Early activity and exercise accelerate compensation. [65]

In bacterial infections, the outcome depends on the prompt initiation of antibacterial therapy and the removal of the lesion from the middle ear. Delayed treatment increases the risk of persistent hearing loss and labyrinthitis-ossification. [66]

The presence of risk factors such as immunodeficiency and severe comorbidities impairs recovery and requires closer monitoring. [67]

With proper routing and adherence to rehabilitation recommendations, most patients return to their normal activities, avoiding rehospitalizations and decreased quality of life. [68]

FAQ

Question 1. How can labyrinthitis be distinguished from isolated inflammation of the vestibulocochlear nerve at home?
If there is hearing loss and tinnitus on the side of the ear experiencing vertigo, labyrinthitis is more likely; if hearing is not affected, isolated inflammation of the nerve is present. A doctor makes a definitive diagnosis after audiometry and examination. [69]

Question 2. Do all patients with labyrinthitis require antibiotics?
No. Antibiotics are ineffective against the viral serous form. They are indicated for bacterial infections and complications of otitis media, where systemic regimens are used, taking into account penetration into the central nervous system and based on culture results. [70]

Question 3. Do steroids help?
In isolated vestibulocochlear nerve inflammation, early methylprednisolone improved functional recovery; the addition of an antiviral drug in the study had no effect. In sudden sensorineural hearing loss, steroids are discussed according to clinical guidelines. [71]

Question 4. How long can vestibular sedatives be taken?
Short-term use, usually 2-3 days, to get through the acute phase. Long-term use slows recovery and is avoided. [72]

Question 5. What is vestibular rehabilitation and does it really work?
It is a set of exercises for gaze stabilization, movement adaptation, and balance training. Its effectiveness has been confirmed by systematic reviews and randomized trials. [73]

Question 6. Can severe consequences be prevented?
Yes. Timely treatment of otitis media, vaccination against Haemophilus influenzae type b and pneumococcus, caution with ototoxic drugs, and early rehabilitation reduce the risk of irreversible disorders. [74]

Question 7. When is imaging needed?
In cases of signs of central involvement, atypical results of oculomotor tests, severe course or suspected complications of otitis media, magnetic resonance imaging and, if necessary, high-resolution computed tomography of the temporal bones are indicated. [75]

Question 8. What happens if left untreated?
Some patients with viral hearing loss will recover, but it will take longer and there is a risk of prolonged instability. Bacterial hearing loss carries a high risk of permanent hearing loss and serious complications, so urgent treatment is needed. [76]

Table 6. Brief action plan for a patient with suspected labyrinthitis

Situation	Action
Sudden hearing loss and severe dizziness	Urgently contact a doctor for audiometry in the coming days.
Severe neurological signs	Call an ambulance immediately
Acute dizziness without warning signs	A short course of symptomatic medications for 2-3 days and early mobilization
Prolonged complaints > 2-3 weeks	Request a referral for vestibular rehabilitation

[77]