In an interview with People, Phillips's father, who is also named Phillip Phillips, revealed that his son had eight surgeries for chronic kidney problems since the start of the Fox show's season.
"He's been doing [well], but it's just gruelling hours and it's just amazing what he's done through the journey," his father said. "Eight operations since we started American Idol.
"He's hitting 50%, but he's still up there swinging away."
The singer will undergo another operation in the next few weeks in order to reconstruct his kidneys. His father promised that he will be healthy in time for the 'Idols Live' tour.
"He's healthy, he's good. His kidneys are good," said Phillips Sr. "I can't wait for America and the whole world to see him [after his surgery], because he's a big cut-up. He's going to have some fun."
Watch Phillip Phillips winning American Idol below: