One nose out of air is mainly seen in the following diseases: first, chronic hypertrophic rhinitis with deviated septum, where ventilation is significantly worse on the side of the deviation than on the other side. During the clinical examination, it can be seen that the ventilation on the side of the deviated septum is significantly restricted and requires corrective surgery of the septum and partial excision of the inferior turbinate. The second type, chronic sinusitis with nasal polyps, is mainly unilateral nasal polyps. The nasal cavity on the side with nasal polyps is blocked, resulting in poor nasal ventilation and nasal congestion. The third, the tumor inside the nasal cavity, common nasal cavity inversion papilloma, mostly unilateral, often patients will unilateral nasal congestion, runny nose, nasal discharge with blood and other clinical manifestations, generally the above diseases can be identified by checking the sinus CT basic.