Labyrinthitis is an ear disorder that involves irritation and swelling of the inner ear.

The cause of labyrinthitis is unknown. However, it commonly occurs after otitis media (ear infection) or an upper respiratory infection, so it is thought to be related to infection with a virus or bacteria. It may also follow allergy, cholesteatoma, or after taking certain drugs that are dangerous to the inner ear.

During labyrinthitis, the parts of the inner ear become irritated and inflamed. This interferes with their function, which includes the ability to keep your balance.

The following raise your risk for labyrinthitis:

• Recent viral illness, respiratory infection, or ear infection
• Use of certain prescription or nonprescription drugs (especially aspirin)
• Stress
• Fatigue
• History of allergies
• Smoking
• Drinking large amounts of alcohol

• Dizziness
• Abnormal sensation of movement (vertigo), possibly severe, with nausea and vomiting
• Loss of balance, especially falling toward the affected side
• Hearing loss in the affected ear
• Ringing or other noises in the ears (tinnitus)
• Involuntary eye movements (nystagmus)

An ear examination may not reveal any problems. Tests will be done to rule out other causes of dizziness or vertigo. These may include:

• Head CT scan
• MRI scan
• Hearing testing (audiology/audiometry)
• Caloric stimulation (tests reflexes of the eye)
• Electronystagmography
• EEG
• Evoked auditory potential studies