Ozzy Osbourne has revealed he is battling a ''mild form'' of Parkinson's disease.

The 71-year-old Black Sabbath singer says he felt guilty about not telling his fans, and revealed he was diagnosed with PRKN 2 in February last year.

Speaking in a joint interview with his wife Sharon Osbourne on Good Morning America, the rocker said, "It's been terribly challenging for us."

"I did my last show New Year's Eve at The Forum. Then I had a bad fall. I had to have surgery on my neck, which screwed all my nerves.

"A year ago next month I was in a shocking state. I'm on a host of medication, mainly from surgery."

"I've got numbness down this arm from surgery, my legs feel like they're going cold, I don't know if that's from the Parkinson's."

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Sharon said his diagnosis is "not a death sentence by any stretch of the imagination" and revealed the couple will be going to a doctor in Switzerland in April as they cannot get anymore answers from the US, where they live.

"We're going to a professor in Switzerland. And he deals with getting your immune system at its peak," she said.

"We're going to go anywhere we can to get answers."

Ozzy added: ''We're lucky we can afford to do that. To hide something is hard - you never feel proper.

"You feel guilty. I'm no good with secrets. I cannot walk around with it anymore. It's like I'm running out of excuses. I feel better now that I have owned up to the fact that I have a case of Parkinson's.''