: Occurs when the immune system mistakenly attacks brain cells, often triggered by a previous infection or certain cancers (paraneoplastic syndromes).

Encephalitis ( in French) is a medical emergency characterized by inflammation of the brain tissue (parenchyma). It typically manifests as a combination of fever, headache, and an altered state of consciousness, such as confusion or agitation. Core Medical Overview

: Most commonly caused by viruses like Herpes Simplex Virus (HSV), West Nile virus, or Varicella-Zoster (chickenpox/shingles).

: High temperature, seizures, personality changes, difficulty speaking, and loss of consciousness. Acute encephalitis – diagnosis and management - PMC - NIH