A nostril out of breath clinically have the following hazards: 1, hypoxia, this is a very obvious problem, because a nostril out of breath lead to the patient always appear body hypoxia, lack of oxygen. For children, the lack of oxygen may affect their physical development, and may have an impact on their IQ if it lasts a long time. For adults, long-term oxygen deprivation is prone to cardiovascular and cerebrovascular diseases, such as coronary artery disease induced by long-term oxygen deprivation in the heart, and cerebral insufficiency of cerebral blood supply, cerebral infarction, and other related changes induced by long-term oxygen deprivation in the brain. 2, a nostril out of breath leads to frequent open-mouth breathing, which can easily affect the patients’ face in time, especially children. The patient’s face, especially children, is prone to form a similar adenoid face in a long time. 3, long-term inhalation through one nostril, the air does not pass through the nasal cavity of the moist, and it is easy to induce pharyngitis, pneumonia and other related types of diseases in a long time.