The best candidates for UPPP are patients whose tonsils can be visualized when they open their mouths fully. This reduces the possibility that a large tongue is the primary source of obstruction. Although short-term results following UPPP have been encouraging, in some individuals scarring produces narrowing of the airway, leading to recurrent obstruction. Under general anesthesia, UPPP is performed by removing the uvula and a small portion of the soft palate. If enlarged tonsils are present, they will be removed at the same time. Often individuals with obstructive sleep apnea have concurrent nasal obstruction, which contributes to their condition. Many physicians will surgically correct a deviated nasal septum and/or reduce the size of the turbinates at the same time as performing a UPPP.