Dear Dr. K: I’ve lost my sense of smell. Could this be due to allergy?
The answer to your question is, yes, it could be, but it is unlikely. I say that because on your recent visit here your allergies were under excellent control and the only time I’ve seen anosmia (loss of sense of smell) from allergy is when it is severely out of control.
A complication of allergy that frequently causes anosmia is nasal polyposis. Treatments of the polyps via nasal sprays and/or surgery usually returns the sense of olfaction (smell).