Minor cases of brain swelling due to causes such as moderate altitude sickness or a slight concussion often resolve within a few days. In most cases, however, more treatment is needed quickly.

In rare cases, the Oropouche virus can cause more severe conditions, such as excessive bleeding, brain swelling, or Guillain-Barré syndrome, which can lead to muscle weakness, numbness and paralysis.

About 1 in 1,000 patients develops encephalitis, or swelling of the brain, and there are 1 or 2 deaths per 1,000, according to the Centers for Disease Control and Prevention.

6:45 p.m. April 22, 2025: Updated measles case data added. Measles is more than a rash, runny nose and a fever — it can cause brain swelling, blindness and wipe out the immune system’s memory ...

An inquest into the death of jockey Michael O'Sullivan has been told that the 24-year-old died of a severe traumatic brain injury, complicated by brain swelling with cerebral infarction, due to a ...