Vestibular neuronitis is a sudden vertigo disorder caused by the involvement of vestibular neurons, a type of peripheral neuritis in which the lesion occurs in the vestibular ganglion or in the centripetal part of the vestibular pathway. The vertigo is mainly characterized by spontaneous nystagmus and, in severe cases, nausea and vomiting, but no tinnitus or deafness. The duration of vertigo is relatively short, often gradually resolving within a few days, and usually fully recovering within two weeks. A few patients can have a short period of residual dizziness, lightheadedness and unsteadiness of varying degrees, lasting several days or months, with symptoms worsening with activity.