A deviated septum can affect breathing in severe cases. Nasal septum deviation will cause narrowing of the nasal cavity, resulting in poor nasal ventilation, nasal septum deviation more persistent nasal congestion, such as one side of the deviation for unilateral nasal congestion, there will be the opposite side of the inferior turbinate compensatory hypertrophy, if the S-shaped deviation is bilateral nasal congestion, if the bilateral alternating congestion, suggesting that the complication of chronic rhinitis. Let the patient form the habit of open-mouth breathing, long-term open-mouth breathing is easy to lead to oropharyngeal dryness, chronic pharyngitis; open-mouth breathing will also affect the maxillofacial bones and teeth arrangement, resulting in the phenomenon of the sky or the sky. When the deviated nasal septum affects breathing, surgery should be performed in time. Commonly used surgical methods are septal submucosal orthopedic surgery and septal submucosal resection, through which the narrowing of the nasal cavity and poor nasal ventilation can be lifted to improve the patient’s habit of open-mouth breathing. Patients with deviated nasal septum should go to the hospital in time, and under the guidance of the doctor to carry out regular treatment to prevent the complications caused by deviated nasal septum.