Cindy McCain, the wife of Republican presidential candidate John McCain, went for X-rays at a Michigan hospital on Wednesday after an "enthusiastic supporter" shook her hand a little too hard, exacerbating a pre-existing carpal tunnel injury.

McCain was at a fundraiser in West Bloomfield, Mich., when "someone grabbed her hand really hard and then someone else was pulling her the other way," McCain spokeswoman Jill Hazelbaker said. She was taken to Beaumont Hospital in Royal Oak, where doctors determined she sprained her wrist.

McCain has had previous surgeries as a result of carpal tunnel syndrome, Hazelbaker said.

"Out of an abundance of caution, she decided to leave the event and visit the local hospital for X-rays where she was treated for a minor sprain. We appreciate everyone’s concern and she will be back on the campaign trail tomorrow," she said.