Wood hurt his left side during Monday's matchup against the Phillies and will undergo an MRI Tuesday, Mark Zuckerman of NatsJournal.com reports.
On his last swing, Wood hurt his left side in the sixth inning. The 23-year-old tried to take a couple of swings, but didn't feel comfortable playing the rest of the game. Dylan Crews replaced Wood as a defensive substitution in the bottom of the eighth inning.