Can allergies cause taste loss?

Allergies can cause taste loss indirectly when nasal swelling or mucus reduces your sense of smell, which supplies much of what you experience as flavour. The basic taste signals from your tongue may still work, while foods seem bland or less distinct. A blocked nose, sneezing, an itchy nose, watery eyes, and postnasal drip can support an allergy-related explanation.

When the nasal passages swell, food aromas have less access to the smell-sensing area high inside the nose. This can reduce flavour perception during eating. Taste loss that comes with congestion may improve as the nasal symptoms settle, although the timing varies. A dry mouth, mouth infection, medication effect, or another nose or sinus problem can also alter taste. Viral illnesses, including COVID-19, may affect smell and flavour without typical allergy symptoms, so the surrounding symptoms and timing matter.

Notice whether the change began alongside exposure to dust, pollen, mould, pets, or another familiar trigger. Saline nasal rinsing may help clear mucus when performed with sterile or previously boiled and cooled water and clean equipment. Drink enough fluid, avoid smoke and strong irritants, and follow the label or a clinician’s advice for allergy treatment. Do not put unapproved substances inside the nose. If symptoms continue despite controlling your allergies, arrange an assessment to check your nose, sinuses, mouth, and medicines.

Seek urgent help for trouble breathing, swelling of the lips or tongue, faintness, or a rapidly spreading allergic reaction. Contact a clinician promptly if taste or smell changes are sudden and unexplained, follow a head injury, occur with severe headache or neurological symptoms, or come with high fever, severe facial pain, eye swelling, or worsening illness. Arrange routine care when the change persists, keeps returning, affects eating, or is accompanied by ongoing nasal blockage or reduced smell. A clinician can distinguish allergic rhinitis from conditions such as chronic sinusitis, a common cold, or COVID-19.

You could ask: Could nasal inflammation explain this change? Is my smell reduced as well as my taste? Could a medicine, dry mouth, infection, or sinus problem be contributing? Which allergy treatment is suitable for me, and how should I use it? Should I test for a viral infection or have my nose and sinuses examined?