The “Piano Man” singer has been diagnosed with normal pressure hydrocephalus, which can cause mobility and cognitive issues.

Piano Man' hitmaker Billy Joel was recently diagnosed with a brain disorder called NPH or Normal Pressure Hydrocephalus, which led him to cancel his upcoming concerts. But what is NPH? Read on and find out.

Music legend Billy Joel, beloved for his timeless hits like "Piano Man" and "Uptown Girl," has recently announced the difficult decision to cancel all his upcoming concerts, including dates across the U.