Whether the nose is alternately ventilated in normal people, normal people breathe through the nose into the pharynx and then into the trachea, alternately ventilated does not exist in this way of breathing. The nose is always involved in ventilation, alternate ventilation may be a blockage of the nostrils, there may be one nose ventilation, one nose does not ventilation, is a pathological state, not a normal person’s physiological state. The patient can be treated with cold medicine, or medicine to pass the nose, with a few days the symptoms will be significantly improved and relieved, so alternating ventilation is not a normal physiological state, and should be treated with medicine as soon as possible, otherwise it will be very difficult for people to feel.