Loss of smell after flu: what to know

Flu can inflame the lining of the nose and block the path that carries odours to smell-sensing areas. Congestion can also make food seem tasteless because flavour depends heavily on smell. A lingering change may reflect ongoing inflammation rather than a new illness. Other possibilities include allergic rhinitis, chronic sinusitis, a common cold, COVID-19, or Long COVID; the pattern and timing help a clinician sort these apart.

Rest, drink fluids, and avoid cigarette smoke, strong fumes, and unnecessary nose-picking while your nose recovers. Saline nasal spray or a gentle rinse may ease mucus when used safely with clean or sterile water. Do not place essential oils or other irritants inside the nose. Check food labels and use smoke and gas alarms because reduced smell can hide household hazards. If the change continues after other flu symptoms have settled, arrange a primary-care or ear, nose and throat review.

Seek prompt medical advice if loss of smell starts suddenly without congestion, follows a head injury, affects one side, or comes with severe headache, facial swelling, vision changes, confusion, weakness, or trouble speaking. Arrange a routine assessment when it does not begin improving, keeps returning, or is accompanied by persistent nasal blockage, facial pressure, bleeding, or a reduced sense of taste.

Ask whether the nasal lining looks inflamed, whether a smell test or ear, nose and throat referral is appropriate, and which treatments are safe with your medicines and health conditions. Mention when the flu symptoms began, whether congestion remains, and any change in taste or hearing.