CBS "Sunday Morning" correspondent Bill Geist revealed that he has been been diagnosed with Parkinson's Disease.

Geist made the announcement on Sunday, in response to viewers wondering what he's been up to recently.

"My spine and I have been spending a lot of time in doctors' waiting rooms recently, thumbing through magazines so old they must be on loan from the Smithsonian," Geist said. He listed off a number of procedures and tests he underwent recently, and joked that he's had so many steroid shots that major league baseball might ban him from watching games on television.

Geist then told his viewers that he's had Parkinson's for years. "Told no one, not even my kids. Didn't want them to worry. Didn't want to be seen as the sick guy," he said. He added that his Parkinson's was "under control."

Geist's son, MSNBC "Morning Joe" co-host Willie Geist, tweeted support for his father on Sunday. "Proud of my Dad this morning. Not easy to go on TV and tell the world you have Parkinson's. Let's fight it," Geist wrote.