Encephalitis is divided into many types. If it is a simple herpes virus encephalitis infection, this is a rather dangerous type of encephalitis. Before the advent of antiviral drugs, the mortality rate of this type of encephalitis was very high. Now, with improvements in diagnostic and treatment levels and the development of antiviral drugs, the prognosis for this type of encephalitis is generally quite good. As long as the initial condition is not particularly severe, the patient is not in a coma, or there is no obvious continuous epileptic state, the prognosis is still good, and many patients do not have any residual sequelae. However, if the initial condition is quite severe, there is usually some degree of cognitive impairment or weakness in the limbs. Other viral encephalitides, such as those caused by Coxsackie viruses and adenoviruses, tend to have milder symptoms, mainly fever, headache, nausea, and vomiting. These types of encephalitis can mostly be cured with appropriate symptomatic treatment and antiviral therapy.