<ul><li>Billy Joel has canceled the rest of his concert tour after being diagnosed with normal pressure hydrocephalus, a rare brain disorder causing issues with hearing, vision, balance, and memory.</li><li>Normal pressure hydrocephalus (NPH) is a build-up of cerebrospinal fluid in the brain's ventricles, creating pressure on brain tissue and leading to brain damage if untreated.</li><li>Symptoms of NPH include struggles with walking, balance, vision, memory, hearing, mood regulation, and urinary incontinence, with diagnosis involving physical exams, tests, and spinal taps.</li><li>NPH is usually treatable and reversible, commonly addressed by implanting a shunt into the brain to drain excess fluid into other parts of the body like the abdomen.</li></ul>

Billy Joel canceled all concerts after doctors found cerebrospinal fluid buildup in his brain. Here's what that means.

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