Jackson must undergo surgery and will announce the new show dates when the time's right.
Jackson posted a followup message minutes later wishing fans a happy holiday.
This isn't the first time Jackson postponed Unbreakable Tour shows. Her Las Vegas shows scheduled for Oct. 9 and Oct. 10 at the Axis theater inside Planet Hollywood were delayed to the spring after her doctors ordered the "BURNITUP" singer to remain on strict vocal rest. They had plans to move her to a new 20,000-seat arena in May.