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)"
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