She told aarp.org, "I couldn't sing and I couldn't figure out why. I knew it was mechanical. I knew it had to do with the muscles, but I thought it might have also had something to do with the tick disease that I had. And it didn't occur to me to go to a neurologist.”
Ronstadt continued, “I think I've had it for seven or eight years already, because of the symptoms that I've had. Then I had a shoulder operation, so I thought that’s why my hands were trembling."
Eventually she did see a neurologist and the results “shocked” her.
"When ... he said, 'Oh, you have Parkinson's disease,' I was completely shocked. I wouldn't have suspected that in a million, billion years," she explained.The “Blue Bayou” songstress said because of the symptoms, she can’t sing anymore, "No one can sing with Parkinson's disease. No matter how hard you try."