"It's something that's manageable, we hope," added Orioles manager Buck Showalter. "It's something that he can pitch with and through. You don't like it, but we're aware of it. We'll take some precautions where we can with it."
Those precautions include giving Arrieta -- who has been doing daily treatment -- extra rest when necessary. Given that the team has off-days on both Thursday and Monday, Arrieta's next start, tentatively penciled in for Wednesday against St. Louis, could be pushed back further depending on how he feels.
"As of now, I feel like I will be able to make my next start with no issue," Arrieta said. "Last time I had this was in Chicago, and [I] was able to get the job done. I battled. [It was a] very similar start to two nights ago here in Pittsburgh. If I'm able to give that and a little bit more, which I can, then I'll take it."
While Arrieta originally planned to get the spur removed in the offseason, he got a second opinion and chose to leave it in there, because he's pitched with it his entire life. Asked if this inflammation is a result of not getting the surgery as first prescribed, Showalter didn't want to pin it on that.
"It wasn't advised," Showalter said. "He got a second opinion. Believe me, I know all the history of what they say that he can do and what the precautions are. I know what the considerations are. Down the road, we'll see. Right now, it is what it is.
"If he continues down the road that he is, he should be able to make all his starts through the rest of the year. We'll see. We'll keep an eye on it, and if we have to, we'll back off."
Arrieta is 9-4 with a 4.50 ERA in 16 starts, though he labored through Monday's five-inning outing. The 25-year-old right-hander looked physically drained and showcased a dip in velocity in his final few innings before being lifted. Arrieta was charged with three earned runs on three hits and two walks in the 87-pitch start.