Encephalitis is a non-specific inflammation of human brain cells, the causes of encephalitis are multifaceted, such as autoimmune, bacteria, viruses, tuberculosis, fungi and so on can lead to encephalitis, encephalitis diagnosis methods are as follows: 1, according to the characteristics of the history: the patient is more acute onset of disease, 3-5 days onset of the disease, there is a fever, the patient has clinical features, such as impaired consciousness, gibberish, seizures, and so on, which may be some of the more typical symptoms of encephalitis. These may be some of the more typical symptoms of encephalitis. Some patients with encephalitis also show memory and intelligence loss, and language dysfunction.2. Tests: lumbar puncture, routine biochemical examination of cerebrospinal fluid, and sometimes need to check the specific antibody to clarify which type of encephalitis is present, and also can do electroencephalograms and cranial magnetic resonance, to see if the foci of the encephalitis can be seen on the imaging.