How to test for loss of taste

Taste and smell work together, so a blocked nose can make flavour seem absent even when the tongue still detects basic tastes. Recent common cold or COVID-19 can affect smell and taste; symptoms that continue after the infection settles may need review. Avoid treating a home check as a diagnosis.

Choose familiar foods with distinct sweet, salty, sour, or bitter sensations, and test only tiny amounts. Rinse your mouth, check one item at a time, and record what you can detect. Compare the result with your usual experience on another day. Do not use irritating substances, spoiled food, or anything you may be allergic to. If you are unwell with respiratory symptoms, follow current local infection advice and consider an appropriate COVID-19 test where available.

Contact a clinician if taste loss is sudden, complete, persistent, recurrent, or accompanied by loss of smell, mouth changes, medication changes, or neurological symptoms. Seek urgent help for facial weakness, trouble speaking, severe headache, confusion, or difficulty breathing. Long COVID can be considered when symptoms continue after an earlier infection.

Ask whether your symptoms suggest a taste problem, a smell problem, infection, medication effect, or an oral cause. Bring your timeline, recent illnesses, nasal symptoms, medicines, and notes from any home comparison.