Prior to the development of a symptom complex that is specific to<unk> , people may experience prodromal symptoms, including headaches, flu-like illness, or symptoms similar to an upper respiratory infection. These symptoms may be present for weeks or months prior to disease onset. Beyond the prodromal symptoms, the disease progresses at varying rates, and patients may present with a variety of neurologic symptoms. During the initial stage of the disease, symptoms vary slightly between children and adults. However, behavior changes are a common first symptom within both groups. These changes often include agitation, paranoia, psychosis, and violent behaviors. Other common first manifestations include seizures and bizarre movements, mostly of the lips and mouth, but also including pedaling motions with the legs or hand movements resembling playing a piano. Some other symptoms typical during the disease onset include impaired cognition, memory deficits, and speech problems (including aphasia, perseveration or mutism). The symptoms usually appear psychiatric in nature, which may confound the differential diagnosis. In many cases, this leads to the illness going undiagnosed. As the disease progresses, the symptoms become medically urgent and often include autonomic dysfunction, hypoventilation, cerebellar ataxia, loss of feeling on one side of the body, loss of consciousness, or catatonia. During this acute phase, most patients require treatment in an intensive care unit to stabilize breathing, heart rate, and blood pressure. One distinguishing characteristic of<unk>  is the concurrent presence of many of the above listed symptoms. The majority of patients experience at least four symptoms, with many experiencing six or seven over the course of the disease.
Anti-NMDA receptor encephalitis
Neuroleptic malignant syndrome
Anti-Hu associated encephalitis
Psychosis
Anti-VGKC-complex encephalitis
Viral encephalitis
Powassan encephalitis
Autoimmune encephalitis