Can viral fever cause loss of smell and taste?

A blocked or inflamed nose can stop scent molecules reaching the smell receptors. Because smell contributes strongly to flavour, food may then seem bland even when the tongue still detects basic tastes. Some viral infections can also affect smell more directly. Fever by itself is not the only explanation, so the timing of the change, nasal symptoms, and contact with illness matter.

A common cold, COVID-19, sinus inflammation, and allergic rhinitis can all be relevant. Symptoms that continue after the original illness may need a separate review, particularly if smell does not gradually return or other neurological symptoms appear.

Rest, drink fluids, and follow local advice for reducing spread when you have fever or respiratory symptoms. Saline nasal rinses may help congestion for some people when used safely with appropriate water. Avoid inserting objects or strong chemicals into the nose, and take care with smoke, gas, spoiled food, and other hazards that are harder to detect without smell. Keep a note of when the change began and whether it is improving.

Seek urgent care for severe breathing difficulty, confusion, a new severe headache, weakness on one side, collapse, or inability to keep fluids down. Contact a clinician if fever persists, symptoms worsen, smell changes suddenly without nasal symptoms, or the loss continues after recovery. A clinician can assess the nose, sinuses, and wider symptoms.

Could my symptoms fit a viral infection, allergy, or sinus problem? Should I test for COVID-19? How should I protect myself from hazards while my smell is reduced, and when should persistent loss be reviewed?