Normal pressure hydrocephalus is caused by excessive fluid in the ventricles of the brain, according to the websites of Johns Hopkins Medicine.

Musical legend Billy Joel announced Friday that he is canceling all tour dates and revealed he has been diagnosed with normal pressure hydrocephalus (NPH), a condition that affects hearing, vision and...

Joel's condition was exacerbated by recent concert performances, leading to problems with hearing, vision and balance, according to the statement.