Manager Fredi Gonzalez said Wood first told the team he wasn't feeling well Thursday night after the Braves' 10-1 victory over the Brewers.
When the left-hander's condition did not improve by Friday afternoon, the Braves recalled left-hander Ian Thomas from Triple-A Gwinnett to bolster the bullpen. Stults is 1-4 with a 5.36 ERA in seven games, all starts.
Thomas has gone 1-2 with a 3.86 ERA in 20 career relief appearances.
Infielder Adonis Garcia was optioned to Gwinnett to make room on the 25-man roster.