LOS ANGELES — Billy Joel has canceled all upcoming concerts, revealing he has been diagnosed with a brain disorder that causes physical and mental issues.

Joel, 76, has normal pressure hydrocephalus, or NPH, according to a statement posted Friday on the piano man’s social media. “This condition has been exacerbated by recent concert performances, leading to problems with hearing, vision and balance,” the statement said.

“Under his doctor’s instructions, Billy is undergoing specific physical therapy and has been advised to refrain from performing during this recovery period.”

Symptoms of NPH — in which cerebrospinal fluid accumulates in the ventricles of the brain but pressure doesn’t increase — include difficulty walking, according to the Alzheimer’s Association. Sufferers walk with a wide stance and their bodies leaning forward, as if they were trying to maintain balance on a boat.

The association’s website says that another symptom is cognitive decline, including slowed thinking, loss of interest in daily activities, forgetfulness, short-term memory loss and difficulty completing ordinary tasks. Later in the disease, bladder control can become an issue.

NPH is one of the few causes of dementia or cognitive decline that can be controlled or reversed with treatment, the association’s website says. Surgical treatment usually involves placement of a shunt. The condition is often misdiagnosed as Alzheimer’s or Parkinson’s disease.

Danny Bonaduce of “The Partridge Family,” radio and wrestling fame was diagnosed with NPH in 2023. The 65-year-old said in a 2024 interview that he initially thought he’d had a stroke, while doctors thought it was early-onset dementia or Alzheimer’s. It took “the better part of a year” for him to get a correct diagnosis, he said.

Bonaduce’s memory loss appears to have been serious: He showed the interviewer a photo of himself in a wheelchair checking out the house where he and his wife now live. He said he has no memory of visiting the place multiple times before moving there.

Billy Joel’s message Friday follows his mid-March announcement that he would postpone his upcoming tour to manage his health after surgery for an unspecified condition. At the time, the singer expected a full recovery after physical therapy.

Now, the statement said, Joel is “thankful for the excellent care he is receiving and is fully committed to prioritizing his health” and “looks forward to the day when he can once again take the stage.”

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

In late February, the “Just the Way You Are” singer fell after performing “It’s Still Rock and Roll to Me” in Connecticut. He quickly recovered; it’s unclear whether that incident was a symptom of the disease or simply coincidental.

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(L.A. Times staff writer Alexandra Del Rosario contributed to this report.)

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