Nonallergic rhinitis, with a focus on vasomotor rhinitis: clinical importance, differential diagnosis, and effective treatment recommendations

The term "rhinitis" denotes nasal inflammation causing a combination of rhinorrhea, sneezing, congestion, nasal itch, and/or postnasal drainage. Allergic rhinitis is the most prevalent and most frequently recognized form of rhinitis. However, nonallergic rhinitis (NAR) is also very common, affecting millions of people. By contrast, NAR is less well understood and less often diagnosed. Nonallergic rhinitis includes a heterogeneous group of conditions, involving various triggers and distinct pathophysiologies. Nonallergic vasomotor rhinitis is the most common form of NAR and will be the primary focus of this review. Understanding and recognizing the presence of NAR in a patient is essential for the correct selection of medications and for successful treatment outcomes.