"Brain fever" is an outdated medical term that was used as a synonym for phrensy, a state of extreme mental agitation, delirium, or frenzy. It was commonly used in early 19th-century medical literature.
Today, brain fever is not a recognized medical term. The conditions it likely referred to are now understood as various forms of encephalitis or meningitis.
- Encephalitis is an inflammation of the brain, often caused by viral or bacterial infections, or by the immune system attacking the brain.
- Meningitis is an inflammation of the membranes surrounding the brain and spinal cord, also often caused by infections.
While "brain fever" is no longer used, it's important to remember that these conditions can be serious and require prompt medical attention.
