Ozzy Osbourne's ability to sing could be adversely affected by his Parkinson's disease diagnosis, according to medical experts.

Ozzy and his wife Sharon revealed that Ozzy was afflicted with Parkinson's during an interview last week on Good Morning America, saying that he is treating the disease with medication.

Dr. Rachel Dolhun, vice president for Medical Communications at the Michael J. Fox Foundation For Parkinson's Research, told Forbes that patients often experience difficulties with speech and swallowing while battling the disease.

She explained, "It does this by affecting the way the vocal cords and swallowing muscles actually move . . . This is really a core part of Parkinson's for a lot of people and it becomes a very difficult symptom to manage."

John Lehr, head of the non-profit Parkinson's Foundation, concurred that that 89 percent of people with Parkinson's experience speech or voice disorders, saying, "It makes just having a normal conversation, not even just singing, very difficult."

Even before this, Ozzy admitted a while back that his voice doesn't always hold up these days: "Sometimes it blows out. I do the best I can. Sometimes I sound terrible, and sometimes it's good, you know. But I'm only human. I mean, I'm honest about it, you know."

The singer received the Parkinson's diagnosis last February after several other health issues derailed his 2019 tour plans. Ozzy expects to resume touring this spring behind his new album, Ordinary Man.

AUDIO: OZZY OSBOURNE ON HIS VOICE HOLDING UP