Autoimmune encephalitis can develop at any age and is usually subacute or acute. Some patients may have fever and headache prior to the onset of the disease. The main manifestations of the attack are abnormal mental behavior, seizures, and autonomic dysfunction, etc. Sleep disorders and limb tremors may also occur. I. Main symptoms 1. Mental behavior abnormalities: Patients can have symptoms of mental behavior abnormalities, cognitive impairment, memory impairment or attention loss, etc.; 2. Seizures: Patients are affected by the excitability of the nervous system and can have repeated convulsions; 3. Involuntary movements: Patients have limb tremors or involuntary movements of the mouth and face, and can easily bite their mouths; 4. Autonomic dysfunction: Including blood pressure abnormal, tachycardia, hyperventilation, central fever, hypothermia, etc. Other symptoms 1, sleep disorders: mainly sleep cycle disorders, excessive sleep or reduced sleep, obstructive sleep apnea, wheezing, etc.; 2, limb tremor: there may also be limb tremor, such as in the nervous system, like tremor, abnormal muscle tone; 3, ataxia: due to cerebellar lesions can appear abnormal posture, limb paralysis and other ataxic performance. When patients present with recent memory loss with seizures and abnormal limb activities, they should seek medical attention promptly. The doctor will make a comprehensive judgment based on the patient’s clinical manifestations, combined with cerebrospinal fluid and electroencephalogram examinations.