Kerry Wood gave up solo homers to Ken Griffey Jr. and two others, then left the game after only three innings because of more shoulder woes Wednesday night, leaving the Cubs with a much bleaker future following their 9-3 loss to the Cincinnati Reds. "The last thing we need right now is for him to go down," catcher Michael Barrett said. Wood (3-3) couldn't get loose on a warm, muggy night, an ominous development for a pitcher who has already tangled twice with shoulder problems this season. He was limited to three spring training starts because of bursitis, and was on the disabled list from May 3 to June 29 with a strained shoulder. In his fifth start since returning, Wood never looked right. "It's a concern, but you don't want to jump to conclusions yet," manager Dusty Baker said. "We took him out more as a precaution than anything. His velocity was down. "He warmed up great and didn't feel anything. That one inning he started to feel something, whatever it was." Wood was scheduled for an exam with Dr. Tim Kremchek on Thursday. The Cubs then will decide whether to get medical tests on Wood, who didn't stay around to talk to reporters. Wood also left a game April 30 against Houston after three innings because of a sore shoulder, his prelude to going on the disabled list. "It's kind of what he had in spring training and what we were dealing with after that Houston game," trainer Mark O'Neal said. "We don't want to let this develop into anything significant."