Billy Joel, the Long Island native and legendary singer-songwriter, has canceled all of his upcoming shows after being diagnosed with a brain condition known as Normal Pressure Hydrocephalus, according to a statement released on his Instagram account Friday.

“I’m sincerely sorry to disappoint our audience, and thank you for understanding,” Joel said in the statement.

Ticket holders will automatically receive refunds, the message said.

The Piano Man, who concluded a historic residency at Madison Square Garden last year, said the decision to cancel came under doctor’s orders, following worsening symptoms during recent performances.

NPH, a relatively rare condition that most often affects older adults, is marked by an abnormal buildup of spinal fluid in the brain, and can lead to balance issues, difficulty walking, vision problems and other symptoms.

Joel turned 76 years old earlier this month.

The music legend is currently undergoing physical therapy, according to the statement.

His upcoming touring appearances included shows with Rod Stewart, Sting and Stevie Nicks.