G05: Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

Encephalitis, myelitis, and encephalomyelitis refer to a group of conditions which result in inflammation of different sections of the central nervous system, due to diseases that originate elsewhere in the body. Encephalitis involves inflammation of the brain, myelitis pertains to the spinal cord, and encephalomyelitis is inflammation of both the brain and spinal cord. The illnesses in this group are typically triggered by infections, frequently viral, but they can also be due to other diseases like autoimmune disorders. Common symptoms include headaches, fever, fatigue and muscle weakness, though severity can range widely, with some people experiencing major neurological problems. These conditions generally lead to swelling and damage in the parts of the nervous system they affect, often resulting in long-term complications especially if not diagnosed and managed at an early stage.