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Labyrinthitis, also known as otitis interna, vestibular neuronitis and vestibular neuritis, is a problem of the inner ear. It results in vertigo and also possible hearing loss or ringing in the ears. It can occur as a single attack, a series of attacks, or a persistent condition that diminishes over three to six weeks. It may be associated with nausea, vomiting. Vestibular neuronitis may also be associated with eye nystagmus. The cause is often not clear. It may be due to a virus, but it can also arise from bacterial infection, head injury, extreme stress, an allergy, or as a reaction to medication. 30% of affected people had a common cold prior to developing the disease. Both bacterial and viral labyrinthitis can cause permanent hearing loss in rare cases. It appears to be caused by an imbalance of neuronal input between the left and right inner ears. Vestibular neuritis affects approximately 3.5 per 100,000 people per year. The typical age of onset is between 30 and 60 years, and the age distribution plateau is between 40 and 50 years. There is no significant gender difference.〔 It derives its name from the labyrinths that house the vestibular system, which senses changes in head position. ==Signs and symptoms== The main symptom of labyrinthitis is severe vertigo. Rapid and undesired eye motion (nystagmus) often results from the improper indication of rotational motion. Nausea, anxiety, and a general ill feeling are common due to the distorted balance signals that the brain receives from the inner ear. This can also be brought on by pressure changes such as those experienced while flying or scuba diving. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「labyrinthitis」の詳細全文を読む スポンサード リンク
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