The American Idol host underwent a "procedure" after filming the show on Wednesday as he needed treatment to remove scar tissue from an old tendon injury.
He revealed on Twitter: "I have a tiny tear in my elbow...pausing life for procedure."
He later explained during his KIIS-FM show: "I had a probe stuck into my right elbow. I'm not a robot [but] they went in with a tiny little probe and they scraped some scar tissue from the tendon, cause I tore the tendon from working out."
Ryan - who admits he is "not a great patient" - was wide awake during the surgery but admits he couldn't bear to watch what the doctor was doing.
He said: "I couldn't look. But I could feel the pressure.
"It was very easy and practically noninvasive."
While the procedure went well, Ryan hadn't expected it to take so long and ended up with a schedule clash.
He said: "I didn't calculate suturing into my schedule. I thought it was an in-and-out, 12-minute procedure."
The 37-year-old star later tweeted a picture of his arm showing where he had been treated.
Alongside the image, he wrote: "Will this be noticeable in my mesh falcons jersey? funny bone not so funny today.(sic)"
24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.
Britain's baby Prince George has stepped out in public with his parents for the first time in Australia, for an encounter with wildlife at Sydney's Taronga Zoo. Read More »
Royal watchers are scrutinising the duchess of Cambridge on her New Zealand tour after husband Prince William appeared to hint a second baby is on the way. Read More »
Kate and William drop some sick beats!
12 pics of Prince William and Duchess Kate!
New great pics of baby Prince George!
20 new pics of Kate and William.
6 best pics from the royal tour!
Check out these pics of Prince George!
10 pics from Will and Kate's visit.
Kate and Will wows the crowd!
South AfricaDiscovery ITMarket Related
South AfricaCity PressMarket Related
South AfricaCity PressR572517 - R935763
HousesR 2 299 000
HousesR 2 495 000
HousesR 2 050 000