If the patient's encephalitis is caused by a viral infection, they usually exhibit fever, often a high fever with temperatures reaching above 39°C, accompanied by significant symptoms such as headache, nausea, and vomiting. Some patients may also experience cognitive dysfunction, epileptic seizures, and psychiatric symptoms. Therefore, it is crucial to seek medical attention promptly, complete examinations such as electroencephalography, lumbar puncture, and cranial magnetic resonance imaging, and timely apply effective antiviral medications. It should be noted that some encephalitis is caused by autoimmune reactions, referred to as autoimmune encephalitis, which is relatively rare clinically. This type of encephalitis generally does not present with fever. (Please use medications under the guidance of a doctor.)