Kerry Wood will miss at least one start after getting a cortisone shot Thursday in his aching right shoulder, which has forced him onto the disabled list once already this season. Wood lasted only three innings in the Chicago Cubs' 9-3 loss to the Cincinnati Reds on Wednesday night, giving up three solo homers. His shoulder was stiff and his fastball subpar. Wood was examined Thursday by Dr. Tim Kremchek, who consulted with a Cubs' doctor before giving the injection. Wood will rest the shoulder for a couple of days before seeing whether the cortisone gets rid of the inflammation and pain and allows him to keep pitching. "It's frustrating, especially with the amount of time I've missed," said Wood, who was on the disabled list from May 3 to June 29 with a sore shoulder. "So we got the shot, went with a little more aggressive treatment this time. We'll see if that will take care of it."