Hill received an MRI on his back Saturday, according to the team.
He was initially hurt in Game 1 of the Cavaliers' first-round series when Trevor Booker set a back screen on him.
Hill felt stiffness in his back between Games 1 and 2. He felt well enough to score 11 points in the first half of the Cavs' 92-90 Game 3 loss to the Pacers before his back "locked up," according to coach Tyronn Lue.
The Cavaliers trail the Pacers 2-1 in the series.