Alternating nasal congestion is a form of nasal congestion, mainly manifested as one nostril is ventilated and the other nostril is not ventilated, or change position, the nostrils of nasal congestion will change to each other, different from the persistent nasal congestion. Persistent nasal congestion is a nostril or two nostrils have been nasal congestion, there is no one will pass, one will not be the case. Alternating nasal congestion is mainly seen in acute and chronic rhinitis, and it is mainly simple rhinitis. Some factors will affect the alternating nasal congestion, such as nasal congestion with the influence of gravity, body position change, in the lower part of the nasal congestion is likely to occur, the upper part may be better, affected by the normal nasal filling cycle of the inferior turbinate, called the nasal cycle.