Loss of taste in the tongue: what to know

Taste buds on the tongue detect basic tastes, while smell adds much of the detail that makes food seem flavourful. A blocked nose can therefore make food seem bland even when the tongue is healthy. A common cold or COVID-19 may affect this experience, and Long COVID can be associated with continuing changes after infection.

A coated or sore tongue, mouth infection, burns from hot food, dry mouth, smoking, dental problems and some medicines may alter taste. Tell a clinician whether the change is on the whole tongue or one area, whether there is pain or a coating, and whether smell has changed.

Drink suitable fluids, clean the tongue gently as part of normal oral care, and avoid tobacco and very hot foods while the mouth is irritated. Do not scrape forcefully or use strong mouth products that sting. Review recent medicines with a pharmacist or doctor rather than stopping them yourself.

A dentist can assess teeth, gums, dentures and oral tissues; a clinician can check the nose, throat, nerves and general health. Record foods that taste different and any timing around illness or treatment.

Book an assessment if the change lasts, keeps returning, or comes with mouth pain, bleeding, a persistent patch or ulcer, swallowing difficulty, or reduced intake. Seek urgent help for facial weakness, trouble speaking, sudden confusion or breathing difficulty. These warning signs need prompt evaluation rather than home treatment.

Ask whether the tongue, saliva, teeth, nose or a medicine could be involved, whether an oral examination is needed, and what symptoms would make testing or referral appropriate.