Nasal obstruction is a symptom rather than a stand alone diagnosis, and there is a wide range of medical and structural problems that can affect your ability to breathe properly. Structural problems caused by deformities of the cartilage or bony structures of the nasal framework are common causes of nasal obstruction. These include a deviated nasal septum, swollen turbinate tissue, nasal polyps, and large adenoids. Other causes may be non-anatomical and due to conditions that cause the nasal lining to swell, including chronic sinusitis or a thyroid abnormality. Each of these nasal obstructions can often be corrected using a variety of surgical techniques.