Is Mike Trout’s balky back a source of concern? (USATSI)
Is Mike Trout’s balky back a source of concern? (USATSI)

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Angels center fielder Mike Trout exited Tuesday night's game against the Astros (LAA-HOU GameTracker) after 1 1/2 innings because of what the team is calling "mid-back discomfort." Trout had also missed the previous two games with back problems, so this situation certainly bears monitoring.

Some additional details from MLB.com's Alden Gonzalez:

Needless to say, the Angels are hoping this doesn't wind up necessitating a roster move. 

This season, the 22-year-old Trout is carrying on as one of baseball top hitters: .294/.380/.549 (163 OPS+) with 11 homers in 53 games.