What is meant by septal deviation?

Septal deviation refers to the displacement or misalignment of the nasal septum, which is the thin wall of bone and cartilage that divides the two nasal cavities. When the septum is displaced to one side, it can lead to various issues, including difficulty breathing, frequent sinus infections, or nasal obstruction. The extent and direction of the deviation can impact the airflow through the nasal passages, potentially causing discomfort or other symptoms.

The other options, while related to nasal health, do not correctly define septal deviation. Swelling in the nasal cavity typically refers to inflammation or congestion, and enlargement of nose tissues could be indicative of other conditions, such as nasal polyps. Loss of sense of smell, known as anosmia, can be caused by various factors including infections or obstructions, but it does not specifically describe the condition of a deviated septum.