I know that many are worried about me and my health, but I'm okay, says the 76-year-old to the magazine People.
Joel also says that many, including himself, do not know anything about the disease - normal pressure hydrocephalus (NPH).
I'm doing my best to work with it and recover, he says to People.
NPH can cause problems with walking, memory, vision and hearing. According to the singer, he has mainly had difficulty with balance.
Billy Joel - known for songs like "Uptown girl" and "Piano man" - is receiving treatment and recovering. He calls the diagnosis "disturbing" but assures that the situation is under control.
It was frightening, but I'm okay. I don't want people to think I'm deadly ill or so.