Nasal distension may be caused by nasal vestibulitis, nasal vestibular cysts, chronic rhinitis, nasal polyps and other causes. 1. Nasal vestibulitis: diffuse inflammation of the skin of the nasal vestibule, which will feel localized swelling of the nose. 2. Nasal vestibular cyst: a cystic mass that occurs under the skin at the bottom of the nasal vestibule, in front of the pear-shaped foramen, and in the soft tissue of the superficial surface of the alveolar process of the maxilla, with the growth of the cysts, there will be a feeling of distension in the nose. 3. Chronic rhinitis: Nasal turbinate hypertrophy causes long-term nasal congestion, and the nose will feel swollen and uncomfortable. 4. Nasal polyps: as the polyps continue to grow, causing long-term pressure on the nasal cavity, resulting in a feeling of swelling. Nasal swelling may have other reasons, such as nasal swelling, etc. It is recommended that patients should seek medical attention in a timely manner to clarify the cause of the disease, and then standardized treatment.