Wood felt some discomfort after his last outing on Friday in St. Louis. He played catch on Tuesday during an early workout at Marlins Park prior to the start of the Cubs' three-game series against the Marlins, then flew back to Chicago.
"We're 10 games into a 162-game season, we're trying to be smart about it and trying to let him get right here, and hopefully he'll be back real soon," Cubs general manager Jed Hoyer said Tuesday.
Wood has pitched in four games so far, blowing a save in his first outing, then taking the loss in the second.
The Cubs limited Wood's appearances this spring to seven games and a total of five innings. The right-hander apparently had problems "off and on" at that time, Hoyer said.
"It wasn't that we felt he was hurt [in Spring Training], it just didn't feel right, so we tried to back off a little bit and let him gather some strength, and it hasn't worked so far, so we're going to keep trying," Hoyer said.
Wood, 34, has been on the disabled list 15 times in his career, most recently last June because of a blister.