The severity of encephalitis can vary greatly; it is generally caused by viral infection. Among these viruses, Herpes Simplex Virus (HSV) is particularly dangerous. Encephalitis caused by HSV can be very severe, with symptoms including high fever, headache, nausea, vomiting, and other serious manifestations. Some patients may even experience seizures, coma, cognitive decline, and changes in mood and behavior. This type of encephalitis is very severe and definitely requires hospitalization. Typically, hospitalization lasts about 2 to 3 weeks, and proper antiviral treatment is necessary. Additionally, there are other forms of encephalitis caused by different viruses that are relatively milder and may even have a certain degree of self-healing properties. Generally, resting well, drinking plenty of water, and consuming fresh vegetables and fruits can lead to recovery. Therefore, whether hospitalization is necessary for encephalitis depends on the severity of the condition and the assessment of which virus has caused the infection. It cannot be generalized.