(CNN) - Cindy McCain visited a Michigan hospital after a campaign event Wednesday, complaining of pain in her hand.
"At some point during the rope line an enthusiastic supporter shook Mrs. McCain’s hand and exacerbated an existing carpal tunnel condition,” said spokeswoman Jill Hazelbaker. “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."
UPDATE: The campaign reports that Cindy McCain will return to active campaigning on Thursday.
Cindy McCain, who has a brace on her right arm, told reporters she was "fine." Her husband said Wednesday afternoon that someone shook her hand "too vigorously."