Young has felt discomfort in the thumb since getting jammed while taking batting practice on Opening Day, according to head athletic trainer Todd Hutcheson. The level of pain fluctuated with weather conditions in Young's four starts.
"It got significantly worse his last start [Saturday night against the Mets]," Bochy said, "to the point we said we had to get an MRI and see what's going on."
"I've had a couple of good games [in Florida and Colorado] with it," Young said, "and one game where it was erratic. I would guess that the blood flow is restricted. On a cold night like [Saturday night], it affected it more.
"This is not something I've ever experienced before; it's all new. It was a trauma caused by batting. I'll feel a lot better knowing how to treat it."
Young, who rarely batted in the American League with the Rangers the past two seasons, has a pair of RBI doubles in nine at-bats. He is 2-1 with a 4.03 ERA, striking out 19 while walking nine in 22 1/3 innings.
Young played catch on Monday and would throw from the mound on Tuesday.
"We haven't been able to do anything until we saw what it was," Hutcheson said. "The MRI was fine. Hopefully, he won't miss anything and he'll feel good next time out."
If Young is forced to miss a start, Clay Hensley will move up one day and take the Friday night assignment against the Dodgers at PETCO Park.
Padres CEO Sandy Alderson had a statement regarding the remarks by Mets broadcaster Keith Hernandez over the weekend about Kelly Calabrese, the team's muscle therapist.
"The San Diego Padres are disappointed in the remarks of Keith Hernandez on a Mets telecast this weekend involving Padres' staff member Kelly Calabrese," Alderson said.
"Kelly, who is licensed by the Ohio State Medical Board and is certified by the National Strength and Conditioning Association and serves as the Padres full-time massage therapist, is a highly trained and professionally competent member of the Padres team, fully authorized by Major League Baseball to be present during games in the Padres dugout. Her competence and professionalism, not gender, are the important factors in her role with the club.
"Our society has made great strides in gender equity in recent years and that progress should be reflected as well in professional baseball. Keith's remarks were uninformed and were a disservice to Kelly and those women like her who have performed admirably in positions previously reserved for men.
"It is ironic that on the very night these unfortunate remarks were made, the Padres honored members of our military, among them Corie Bush, the recipient of a Purple Heart Medal for injuries she sustained while serving in Iraq. The roles of women in our society have indeed changed and we are all the beneficiaries."
Hutcheson said Calabrese is a valuable member of the club.
"We work on these guys every day," Hutcheson said. "For us to be out here and see what happens is an enormous plus to us. She's working on 10 to 15 guys a day. From the dugout, she can see how a guy's running; it can tip her off.
"It helps us take care of players better if we can see what's going on out on the field. Plus, it helps us to be part of the team. You win championships with a team atmosphere. Kelly works very well with the players; she has the type of personality that fits in."
Through 18 games, the Padres were 16-for-16 in stolen base attempts, taking strides toward becoming a more effective running team to exploit their ballpark's vast outfield dimensions.
Rookie Josh Barfield was leading the club with six steals, right ahead of Dave Roberts, with five.
"I have a red light," said Barfield, who has flourished in the No. 2 hole behind Roberts and was batting .309 coming into Monday night's game. "I can run unless they put up a stop sign. I'm trying to be smart about it. I like to run, but I don't want to run into outs."
Barfield, faster than the scouting reports suggested, has tripled twice to go with two homers. His .456 slugging percentage was highest among Padres regulars through Sunday.
Jake Peavy (1-2, 4.32 ERA) faces the Diamondbacks' Claudio Vargas (1-1, 8.25 ERA) Tuesday night at PETCO Park at 7:05 p.m. PT.