Bailey, the 2009 AL Rookie of the Year and a two-time All-Star, left a spring training game Monday against the Cleveland Indians with elbow discomfort in his pitching arm after facing only three batters. The latest trouble comes after he was shut down at the end of last season with an elbow injury.
He got an out, a batter reached on an error, then Bailey yielded an RBI double to Travis Hafner and was visited at the mound by manager Bob Geren and the A's training staff.
After a couple of moments of discussion, Bailey walked to the dugout.
The right-hander has been on a strict regimen this spring. This was his second outing. He struck out two in one inning in his first appearance.
The A's said they would provide more information on Bailey's status once it was available.
Bailey has 51 saves and a 1.70 ERA over his first two major league seasons.