Not ''all that sneezes'' can be attributed to allergic rhinitis. Perha
ps half of all rhinitis can be a result from a heterogenous group of n
onallergic nasal disorders. Distinguishing these disorders from allerg
ic rhinitis based on history alone can be difficult. In this article w
e review nonallergic rhinitis, the differential diagnosis, epidemiolog
y, pathophysiology, and treatment.