Common Causes of Unilateral Nasal Obstruction

Vestibule
Furuncle
Vestibulitis
Stenosis of nares
Atresia
Nasoalveolar cyst
Papilloma
Squamous cell carcinoma
Nasal cavity
Foreign body
DNS
Hypertrophic turbinates
Concha bullosa
Antrochoanal polyp
Synechia
Rhinolith
Bleeding polypus of septum
Benign and malignant tumours of nose and paranasal
sinuses
Sinusitis, unilateral
Nasopharynx
Unilateral choanal atresia