Loss of smell and taste with a negative COVID-19 test

A negative result lowers the chance that the test detected COVID-19 at that moment, but timing, sample quality and the type of test can affect interpretation. A blocked or inflamed nose can stop scent molecules reaching the smell receptors, which can make food seem bland even when the tongue still detects basic tastes.

A common cold, allergic rhinitis, chronic sinusitis and other respiratory infections can produce this pattern. Smell may also remain reduced while the nose and smell pathways recover after an infection. COVID-19 remains one possible explanation if symptoms continue or new symptoms appear, so follow current local testing and medical advice.

Note when the change began and whether you have congestion, sneezing, facial pressure, fever, cough or altered smells. Drink fluids, avoid smoke and strong irritants, and use gentle nasal care if recommended for you. Do not insert products into the nose or start antibiotics without medical advice.

Use extra care with cooking and household safety because you may not detect smoke, gas or spoiled food. If symptoms do not begin improving, recur, or interfere with eating, arrange an assessment. A clinician can examine the nose, review medicines and decide whether repeat testing or an ear, nose and throat referral is appropriate.

Seek urgent help for trouble breathing, chest pain, confusion, fainting, severe dehydration, or a rapidly worsening illness. Arrange prompt medical review for a severe headache with neck stiffness, new weakness, a head injury followed by smell loss, or persistent one-sided nasal blockage or bleeding.

Book a routine appointment when smell or taste loss lasts beyond the expected recovery from a cold or infection, or when it affects nutrition and daily safety. A symptom alone cannot establish its cause.

Could nasal swelling, allergies, sinus disease or a medicine explain this change? Does the timing of my test and symptoms call for another COVID-19 test? What nasal treatments are suitable, and when should I be assessed for ongoing smell loss?