When fluid builds up around or inside your brain and inhibits typical functioning, it results in normal pressure hydrocephalus, or NPH, according to the Cleveland Clinic. This may lead to difficulties thinking and concentrating, as well as impair movement and memory. The condition may be reversible, and its symptoms could look a lot like dementia.

Singer Billy Joel revealed his diagnosis with a brain disorder called normal pressure hydrocephalus and canceled 17 upcoming concerts while he recovers.

Rock legend Billy Joel, aged 76, has been diagnosed with normal pressure hydrocephalus (NPH), a neurological condition that has forced him to cancel his upcoming tour.