Young, who experienced tightness in his right shoulder after his first start, was placed on the 15-day disabled list on Monday, retroactive to April 7.
He was originally to start the Padres' home opener, but when that became a no-go, he was hoping to pitch later in the week during the homestand. On Sunday, though, the team decided to go the cautious route, placing him on the disabled list.
Young said he's fine with the decision.
"I'm disappointed I'm not out there today or when my next start would have been. But I see the big picture," Young said. "It makes sense to give it a little bit extra rest to make sure it doesn't linger."
Faced with a similar decision a year ago, when he had pain in his shoulder, Young opted to pitch on. He was finally shut down after a start on June 14 and had shoulder surgery a month later.
"Given what I went through last summer, I didn't want to pitch through it," Young said. "I learned the hard way last year, when I pushed through it and ended up needing surgery. It's not worth risking."