A deviated nasal septum refers to the cartilage or bone of the nasal septum being skewed towards one or both sides of the nasal cavities, leading to a series of symptoms such as nasal congestion, nosebleeds, and headaches. Surgical correction of a deviated nasal septum is usually carried out under nasal endoscopy. The surgery involves the removal of the deviated cartilage and bone tissue while preserving the mucosa. Since the mucosa is straight, this corrects the deviated nasal septum, thereby clearing the nasal passages. Symptoms such as nasal congestion, nosebleeds, and headaches can be effectively alleviated through surgery, so for severe cases of deviated nasal septum, surgical removal is often adopted.