Viral encephalitis is not easily cured. Viral encephalitis is an inflammation caused by viral infection to the central nervous system, involving the brain parenchyma, and the most common pathogen is herpes simplex virus. The most common pathogen is the herpes simplex virus. This pathogen enters the brain and causes damage to the frontal lobe, temporal lobe, hippocampus, limbic system, etc. If antiviral treatment is not administered in a timely manner, the patient’s condition is prone to rapid progression and aggravation, resulting in extensive brain cell necrosis and hemorrhage, also known as hemorrhagic necrotizing encephalitis in the past. This results in significant neurological deficits, including mild hemiparesis, speech dysfunction, mental disorders, and symptomatic epilepsy. Even after aggressive treatment, the acute phase symptoms can be alleviated in most patients after the virus is killed, but varying degrees of sequelae remain, and many patients are left with some degree of memory impairment or long-term psychiatric abnormalities.