Encephalitis is an intracranial infection caused by various microorganisms when the immunity of the body is reduced, including viral encephalitis, bacterial encephalitis, tuberculous meningitis, cryptococcal infection and many other diseases. Mild encephalitis is characterized by the following clinical symptoms: 1. varying degrees of headache, mainly pulsating headache at the top of the forehead, aggravated by activity and relieved by rest. 2. fever, with a body temperature of about 38°C, which will rise again after the administration of cooling drugs. 3. varying degrees of nausea and vomiting, caused by increased intracranial pressure due to intracranial edema. 4. some patients may have abnormal mental behavior, manifested as unresponsiveness 5. Some patients can develop symptoms of secondary epilepsy such as aphasic seizures and partial seizures. The vast majority of mild encephalitis heals well and does not leave significant sequelae after 1-2 weeks of treatment.