Monoherpetic encephalitis is clinically common, and in severe cases, patients may experience disorders of consciousness, including comatose states, decerebral cortical states, and vegetative states. Patients may also develop dementia, and may present with a variety of manifestations including psychiatric symptoms and seizures. If the patient has simple encephalitis, the main manifestations in mild cases are headache, nausea, vomiting, and fever, but also limb sensory disorders or motor dysfunction, including limb numbness and pain, but also limb weakness or paralysis of one side of the limbs, etc. The patient may also have speech disorders, which can be manifested as dysarthria or aphasia, as well as hemianopsia quadrant blindness, and in some patients, blindness may also occur. Dizziness may occur if encephalitis affects the brainstem and cerebellum, as well as balance disorders, dysphagia, and choking on water.