Patients with fever and encephalitis have the following symptoms: 1. High fever, usually up to 39°C or higher. 2. The patient may experience recurrent high fever, nausea and jet vomiting, and severe headache. 3. delirium and varying degrees of confusion and impaired consciousness. 4. convulsions, such as straightening of the neck, rolling of the eyes, clenching of the teeth, and straightening of the limbs, when the symptoms are severe. 5. drowsiness and depression. Once the diagnosis of encephalitis is confirmed, active and comprehensive treatment measures need to be taken. Delayed treatment will bring great harm to the patient’s body and can cause serious adverse consequences.