Stewart said Thursday that surgery on the injury, which has lingered for more than a year, is a possibility. He was put on the disabled list Wednesday night and infielder Luis Valbuena has replaced him on the roster.
"I don't know at this point," said Stewart, who will be examined at the Cleveland Clinic. "With all the MRI and X-ray results, nothing of major value came up in there that they say we need to get this done now or this would have been taken care of a long ago. There have been instances where things didn't show up and they can go in and look and see if there are other things. I don't know if we'll go that route but it's definitely a possibility."
Wrist issues bothered Stewart as far back as spring training of last season when he was with the Colorado Rockies. A hamstring injury first put him on the disabled list last year, but he went on the DL again later in the season with what was described as a "wrist contusion."
The Cubs traded for him anyway this offseason, sending Tyler Colvin to the Colorado Rockies. Handed the third base job this spring, it has been nothing but struggles for the left-handed power hitter. He has hit five home runs, but is batting just .201 with 17 RBIs.
He doesn't have soreness in his wrist at all times, but putting his weight on his hands is a chore. He also has a tingling sensation in his left pinky finger and on the outside of his hand.
His new examination will be by an all new doctor that has no information on the injury to this point. By no means does Stewart want to see his season come to end and or have it come to a lengthy halt, but he would like some answers.
"In a way you almost hope there is something there because it has lingered about a year and nothing has ever really come up," he said. "So hopefully seeing a new guy, new eyes on my wrist, maybe he sees something a little different and should know early next week."
Castillo hit .185 in seven games with the Cubs this season before going on the DL with a sprained right knee on May 22.