Billy Joel has cancelled several upcoming concerts due to a diagnosis of Normal Pressure Hydrocephalus, a rare but potentially treatable neurological condition that mainly affects older adults

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.