What should you know about flu symptoms loss of smell?

Smell depends on air reaching sensory areas high inside the nose. Congestion, swelling, or mucus during a cold or influenza-like infection can temporarily block that route. Allergic rhinitis can create a similar pattern, while chronic sinusitis may cause longer-lasting blockage, facial pressure, or thick nasal drainage.

A sudden loss of smell can occur with COVID-19, sometimes without marked congestion. Loss of smell alone cannot identify the cause. Notice whether taste seems reduced because food flavours rely heavily on smell, and record when the change began.

Rest, drink enough to avoid dehydration, and follow local infection-control advice while a contagious respiratory illness is possible. Avoid smoke and strong irritants. Do not put oils, chemicals, or unapproved products inside the nose, and do not drive if you cannot detect important warning smells such as smoke.

Arrange a clinical review if the loss persists after congestion settles, keeps returning, or comes with facial pain, one-sided blockage, nosebleeds, or a head injury. A clinician can examine the nose and choose suitable treatment.

Get urgent help for difficulty breathing, confusion, severe headache with neck stiffness, sudden neurological changes, or loss of smell after a significant head injury. Seek prompt advice for severe facial swelling, eye swelling, vision changes, or rapidly worsening illness.

Ask whether your congestion, allergy, sinus symptoms, or exposure history suggests a particular cause, whether testing is appropriate, and how long you should monitor the change before review.