Nose odor, clinically common causes are nasal foreign body, atrophic rhinitis, fungal sinusitis and so on. 1. Nasal foreign body: when there is a foreign body in the nasal cavity, it will cause inflammation of the mucous membrane in the nasal cavity, the clinical manifestations of the affected side of the nasal cavity has a bad smell, yellow pus nasal discharge, etc., the foreign body will also be formed for a long time, the stone, and in severe cases, it will also cause the nasal turbinate to atrophy or perforation of the nasal septum. 2. Atrophic rhinitis: the disease refers to a slow-onset diffuse, progressive nasal atrophic lesions, the affected population of the nasal mucosa and submucosal blood vessels, bone, glands, etc. will appear atrophy, the clinical manifestations of nasal crusting, nasal congestion, olfactory loss, malodor, nasal cavity, thick purulent secretions and so on. 3. Fungal sinusitis: this condition refers to a common clinical specific infectious diseases in rhinology, which is usually associated with a decline in body resistance, clinical manifestations of unilateral nasal congestion, pus nasal discharge, accompanied by a foul odor. The odor in the nasal cavity is an abnormal phenomenon, and it is recommended that people with the disease should go to the hospital for consultation and examination.