The Twilight actress, who has been shooting the film in Pembrokeshire, Wales, is said to have had a minor accident on Wednesday, shutting down production until later this week.
The news was announced via fellow Snow White actor Max Manganello, who plays a duke's soldier, on his Twitter page that same afternoon.
"It's a wrap for today. Kristen has hurt herself... nothing scary. We shoot on Friday," he wrote.
No further details on her condition are known.
The original message has also disappeared from Manganello's Twitter page.
Snow White and the Huntsman's Prince Charmant, Sam Claflin, has said that Stewart will be a "diamond" leading lady.
Meanwhile, her Twilight co-star Taylor Lautner recently claimed that she will make an "edgy and dark" Snow White.
Move through a gallery of pictures from Snow White and the Huntsman filming below: