The nostrils are alternately breathed, the reason for this is mainly due to the physiological turbinate cycle. Under normal circumstances, the congestion of the inferior turbinates alternately changes, not both turbinates are equally congested, but at intervals of 2-7 hours, the congestion of one nose decreases and the other nose becomes more congested. The clinical function of alternate breathing is to remind the patient to turn over at night and to relieve the patient’s fatigue. If the patient breathes through only one nostril, it is not conducive to the work of the lungs, so this is the principle of alternate breathing in the human nasal cavity bilaterally. The alternate breathing of the human nasal cavity makes the patient’s respiratory function more efficient and promotes better metabolism in the body.