Anosmia Causes - Principal Etiologies of Olfactory Dysfunction
For olfactory disorders (and for most taste problems), the history should include severity and persistence of symptoms. Patients should be asked about medical history of allergic rhinitis or chronic rhinosinusitis (with or without nasal polyps), as well as symptoms of nasal congestion, obstruction, or rhinorrhea. This history correlates with ongoing symptomatic allergic rhinitis or chronic rhinosinusitis (with or without nasal polyps) as the cause of diminishing olfactory function; this may improve after treatment of these conditions.12  Any history of head or facial trauma may indicate cribriform plate damage. Difficulties with memory or neurologic abnormalities may indicate mild cognitive impairment, Alzheimer disease, Parkinson disease, or parkinsonism. A medication history can identify use of agents implicated in smell and taste disorders
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