This surgery repairs a blockage inside the nose caused by a deviated septum. With a deviated septum, there's a problem with the wall that divides the nose into two chambers. A deviated septum may block air coming through one or both nostrils. This makes it harder for you to breathe through your nose. During septoplasty, the surgeon makes cuts (incisions) inside the nose. Then the surgeon trims, reshapes, moves, or removes cartilage and sometimes bone from the septum.