The clinical manifestations of vestibular neuronitis are mainly sudden vertigo and nystagmus, nausea and vomiting. 1. Sudden vertigo: It is the most important clinical manifestation, which is aggravated when the head turns and usually reaches the peak after a few hours or days, and can be relieved thereafter, usually without tinnitus and deafness. It is mainly caused by damage to vestibular neurons. 2. Nystagmus: Patients may experience spontaneous horizontal nystagmus to the healthy side. The vestibular-ocular reflex is absent when the head is turned rapidly to the side of the lesion. 3. Nausea and vomiting: In severe cases, the patient may have nausea and vomiting, leaning to the side of the disease, and pallor. Vestibular neuronitis is often preceded by a history of upper respiratory tract infection, such as herpes zoster virus infection. Suspected vestibular neuronitis requires prompt medical attention and treatment.