Park, who initially experienced anemia on July 28 related to the bleeding disorder, went through tests and missed two weeks, returning on Aug. 11 for two starts. He was scheduled to start Monday night against the Dodgers but experienced a recurrence of the bleeding that morning, and the club sent him to the clinic to get to the root of the problem.
"It's more of a structural thing," Hutcheson said. "They think there's a cluster of blood vessels in his intestine that get ruptured. They don't know if it's food that passes through there and scrapes it."
The stomach, he added, "is clean." A bleeding ulcer has been ruled out.
In the latest episode, Park lost about one-third of his blood, Hutcheson said. In the first case, he lost about half of his blood supply, requiring three units of blood. He was given one unit of blood Monday night and another Tuesday morning.
Emergency starter Tim Stauffer arrived from Triple-A Portland in time to give the Padres six strong innings in a 4-2 win. Park, who is 7-7 with a 4.68 ERA in 23 games, went on the 15-day disabled list with the activation of Mike Thompson. Thompson will start either Friday or Saturday in Denver against the Rockies, manager Bruce Bochy said.
Forced out of his Sunday start after one inning with a muscle problem around his right shoulder blade, Chris Young felt good enough on Tuesday to play catch in the outfield.
"I'm very encouraged," Young said. "My expectations weren't as high two days ago. A muscle strain is similar to a pull, and I didn't know what to expect. I've never had anything like this. Everybody's body responds differently. So far, so good."
Hutcheson said Young "felt a little tightness in the same area where he was finding discomfort two days ago, but he's a lot better. We're definitely happy with his progress."
Padres manager Bruce Bochy said there is a possibility Young will be ready to pitch by Tuesday in Phoenix against the Diamondbacks. If he can't make that start, Stauffer likely will get another shot at showing he's an arm for the future.
Hensley good to go:
A third wheel in the rotation, Clay Hensley declared himself ready for his next start, which he expects to be on Saturday night in Denver. Hensley strained his glute, causing him to miss his scheduled start on Saturday, but he returned on Sunday to work four innings of relief after Young departed.
"I feel good," Hensley said. "It's still a little sore, but every day it's gotten better. I think I'm going on Saturday. That'll give me an extra day, with the day off."
Hensley, 7-10 with a 4.07 ERA, is on the best roll of his young career. He has yielded two or fewer runs in six of his past seven starts, but is only 2-3 in that stretch. He is working on a string of 14 1/3 consecutive innings without allowing an earned run, and his ERA for August is 1.99 in 22 2/3 innings.
Barfield's dad 'fine':
Josh Barfield's father, former Major League slugger Jesse Barfield, was hospitalized on Sunday after an incident in his suburban Houston home involving son Jeremy. Jesse is back home and "doing fine," Josh, the Padres' second baseman, said.
Jeremy Barfield, a senior taken by the New York Mets in the ninth round of the 2006 First-Year Player Draft out of Klein High School, reportedly pushed his father down a flight of stairs after an argument on Sunday morning. Jeremy, who was taken into custody and released after the incident, has not discussed the incident with Josh.
Jesse, a coach to both his sons, watched Monday night's game against the Dodgers on TV and spoke with Josh afterward, in their custom.
"He's back to being a dad and coach," Josh said. "I found out right when it happened. He went to the hospital and got released [Monday]. He's OK. It's been hectic the last 48 hours. I talked to my parents. They've been kind of overwhelmed the last few days.
"It's tough. You come here [to the ballpark] and you've got to separate everything. I didn't even know what happened yet. I'm not going to make any assumptions."
Tip-top of the order:
In the series opener, the Padres enjoyed a clear advantage in production in the top third of the batting order, where the Dodgers, with Rafael Furcal and Kenny Lofton in front of No. 3 hitter Nomar Garciaparra, have been sizzling.
In the opener, after Stauffer set the tone with a perfect first inning, Furcal, Lofton and Garciaparra reached base only twice in 12 combined at-bats.
Meanwhile, Dave Roberts, Brian Giles and Todd Walker were 5-for-11 as a trio. Roberts and Walker each had two hits and scored a run, while Giles and Walker drove in runs.
"Keeping those top two guys off base is the big key," Padres center fielder Mike Cameron said. "Stauffer did a nice job of keeping those two guys under control. They've been killing teams."
Against southpaw Mark Hendrickson on Tuesday night, Bochy reworked his order. Barfield led off, followed by Giles and Cameron. Ben Johnson replaced Roberts in left, and shortstop Manny Alexander made his first start since being summoned from Portland. Mark Bellhorn replaced Walker at third.
Woody Williams (6-4, 3.67) faces All-Star right-hander Brad Penny (13-6, 3.70) in Wednesday night's series finale at PETCO Park at 7:05 p.m. PT.