Billy Joel NPH diagnosis: Doctor explains | ChicagoNOWBilly Joel has canceled all of his upcoming shows after announcing he’s been diagnosed with a neurological condition known as normal pressure hydrocephalus, or NPH. Dr. Webster Crowley, professor of neurosurgery at Rush Medical College, joins "ChicagoNOW" to explain what the condition is. ChicagoNOW is a fast-paced, conversational show that spotlights what’s trending in and around Chicago.