Okay. A cold or other upper respiratory infection (URI) could cause your loss of smell. The good news is that this tends to be reversible when the infection clears up. See your doctor if your symptoms persist.
Next is a question about medicines you may be taking. It may sound strange, but loss of smell may accompany the use of certain medications, especially antibiotics, blood pressure or heart pills, antidepressants, and chemotherapy.
Did your condition begin when you started a new medication?