Nasal Septal deviation. The septum is made of bone and cartilage and separates the right and left nasal passageway, and supports the nose. If the septum is significantly deviated to one side it can cause obstruction.
2. Allergies: Patients who have allergies often get inflammation in the mucosa which is the lining of the nose. This results in nasal obstruction. This can be treated with nasal sprays and allergy testing.
3. Turbinate Hypertrophy