May Be Caused by

 Common

Allergic mucosal swelling

Concha bullosa

Foreign body

Inflammatory mucosal swelling

Nasal plate fracture

Nasal septum congenital deformity

Nasal septum fracture

Polyp

Pseudopolyp

Rhinolith

Traumatic mucosal swelling

Turbinate enlargement

 Uncommon

Antral carcinoma

Antrochoanal polyp

Burkitt lymphoma

Choanal atresia

Choanal stenosis

Dermoid cyst

Esthesioneuroblastoma

Fibroma

Fibrosarcoma

Inverted papilloma

Lymphoma

Mature nasopharyngeal teratoma

Mucocele

Nasal bone hypoplasia

Nasal carcinoma

Neurofibroma

Ossifying fibroma

Osteoma

Rhinoscleroma

Transsphenoid encephalomeningocele

Wegener granulomatosis