We clarified the clinical features of "flavor dysfunction," defined as olfactory dysfunction with self-reported hypogeusia but normal taste function in gustatory tests compared to those of "smell and taste dysfunction" hyposmia and hypogeusia in olfactory and gustatory tests. Patients with flavor dysfunction reported significantly milder taste loss than those with other smell and taste dysfunction. The major smell and taste loss etiology was upper respiratory tract infection (URI) in the flavor dysfunction group and the URI rate was significantly higher in the flavor dysfunction group than in the smell and taste dysfunction group. Smell identification thresholds in T & T olfactometry were not different between groups. Flavor dysfunction, hyposmia was treated medically but not with conventional hypogeusia medication. Medication including zinc was administered for other smell and taste dysfunction. Both groups significantly recovered from taste dysfunction. Our results indicate that treating olfactory dysfunction effectively improves flavor dysfunction but hypogeusia need not necessarily be treated. Hyposmia and hypogeusia must be treated together for other smell and taste dysfunction, making it vital that we conduct appropriate gustatory testing to correctly differentiate between flavor and other smell and taste dysfunctions.