The alternating left and right noses are not ventilated, clinically common in chronic simple rhinitis, this reason is mainly the following: first, the change of temperature, sometimes such as the temperature is too high or the temperature is too low, leading to the expansion of the nasal mucosal blood vessels, resulting in hypertrophy of the nasal turbinate, and then there is a decrease in blood flow and the turbinate is reduced once the temperature changes, thus appearing in the alternating nasal congestion. Secondly, some patients may be too tired and overworked, which may also lead to changes of turbinate enlargement and turbinate shrinkage, resulting in alternating nasal congestion. Third, some patients, such as poor rest, vegetative nerve dysfunction, nervousness and other factors such as stimulation may also appear vasodilatation and constriction, thus appearing nasal congestion, nasal congestion relief symptoms. Fourth, some patients, for example, by changing the sleeping position, lying on the side of the lower turbinate due to gravity causes congestion increased, thus appearing nasal congestion, in the upper turbinate congestion reduced out, appearing in the nasal cavity ventilation is good. Other reasons some patients such as prone to malnutrition and other factors stimulation may also be related.