Hernandez said he has been dealing with the injury for the last two weeks. He finally brought it to the team's attention following his May 11 start against Seattle, when he felt a pinching sensation in his shoulder while on the hill.
"I usually feel it a little more the next day or my side day," Hernandez said. "By the fifth day, I feel well enough to where I can pitch and I don't feel it during the game because you've got that adrenaline. My last start [on Tuesday] is why I said something, because I felt it during the game."
Orioles manager Dave Trembley said Hernandez's decision to come forward was the right one, and was hopeful the team's trainers will be able to get Hernandez back on track.
"It's best just to calm it down now and miss one start and not four or five," Trembley said. "Don't let the thing get worse, let the trainers deal with it."
Hernandez, who classified himself as day-to-day, said there was no plan to undergo an MRI or do anything besides rest and get treatment on his shoulder. He was unsure if he would be able to make his next scheduled start -- which would be Friday at Washington -- and Trembley said a decision will need to be made when Hernandez throws his next side session.
Long reliever Mark Hendrickson made the spot start in Hernandez's place, in a move that was decided late Saturday night. Hendrickson allowed three runs on seven hits over five-plus innings in the Orioles' 5-1 loss to the Indians.
"I didn't think I was going to miss a start; I thought I was OK enough to pitch through it," Hernandez said. "I thought it was one of those times during the season where you are going to feel aches and pains."
Though he hasn't pitched up to his capability this season, the 25-year-old Hernandez wasn't ready to blame his recent performance, which includes a 9.64 ERA in his last two starts, solely on the shoulder injury. But given his tendency to start the game well before dropping off and falling victim to one bad inning, it's possible the shoulder issue, which Hernandez described as an inflamed bicep, was a factor.
Hernandez has lost his past 11 decisions, which is the longest active losing streak in the Major Leagues and the second-longest streak in O's history, behind Mike Boddicker's 13 in the late 1980s. Since winning the fifth-starter spot in the final week of Spring Training, Hernandez is 0-5 with a 5.84 ERA in seven starts.
A former starter, Hendrickson is 1-0 with a 6.75 ERA out of the bullpen this season. He picked up the win in 1 1/3 scoreless innings on Thursday night.
Brittany Ghiroli is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.