Can influenza cause loss of taste and smell?

Taste and smell work together, so blocked nasal passages can make food seem bland even when the tongue still detects basic tastes. Fever, congestion and inflammation during influenza may cause this change. A sudden or marked loss of smell can also occur with COVID-19, and a common cold or another nasal problem may produce similar symptoms.

The timing matters: symptoms beginning with congestion and improving as the infection settles suggest a temporary effect, while persistent, isolated or worsening loss deserves assessment. Do not assume the cause from this symptom alone.

Rest, drink fluids and follow advice for the respiratory infection. Saline nasal care may help some people with congestion when used as directed. Avoid smoke and strong irritants, and check food carefully because reduced smell can make spoiled food harder to notice. Consider testing and infection precautions according to current local guidance if COVID-19 is possible.

Seek urgent help for breathing difficulty, severe dehydration, confusion, or a rapidly worsening illness. Arrange medical review if loss of smell or taste persists after congestion improves, follows a head injury, affects eating or safety, or occurs with severe headache, facial pain or neurological symptoms.

Ask whether your symptoms fit influenza, COVID-19 or another cause, how to manage nasal inflammation, and when persistent loss should be assessed by a specialist.