The nasal septum is a wall that divides the nasal cavity into two. The anterior part of the septum is composed of cartilage and the back part is composed of bone. Ideally, the septum should be in the midline and the right and left nasal cavities should be of equal width. However, in most people, the septum is not exactly in the midline, there are slight curvatures. Such slight curvatures do not cause any complaints. It is defined as a disease if the whole or only one part of the septum is significantly curved, and if affects the respiration.