Having trouble saying that long word? Another way to describe this condition is
to call it "water on the brain."
Everyone's brain and spinal
cord are cushioned by a liquid that's produced inside the brain. This liquid usually
flows from inside the brain to the outer part and then into the bloodstream. But sometimes
an injury or other problem can block that flow. The fluid then builds up inside the
head. A person with hydrocephalus may throw up, have headaches,
or even changes in behavior.