A rectal balloon apparatus has a shaft with a fluid passageway extending therethrough. A balloon is affixed over an end of the shaft such that the fluid passageway communicates with an interior of the balloon. The balloon has a laterally flat surface thereon when inflated. The laterally flat surface of the balloon has a longitudinal groove formed thereon. The balloon having a pair of bulges formed thereon when the balloon is inflated. A ring is affixed to the shaft adjacent the balloon. The shaft has a plurality of holes formed thereon opening to an interior of the balloon.