The severity of encephalitis varies greatly among individuals. Some mild cases of encephalitis, even with some degree of self-healing, do not require special treatment. For example, encephalitis caused by some enteroviruses and respiratory viruses has a very good recovery, and it is only necessary to prevent complications. However, some types of encephalitis are very dangerous and can even threaten the life of the patient. For instance, herpes simplex virus encephalitis can cause necrosis of the cerebral cortex, leading to high fever, headache, nausea, vomiting, and even epileptic seizures, psychiatric symptoms, and a significant increase in intracranial pressure, requiring urgent treatment.