Do allergies cause loss of smell?

Allergic rhinitis can inflame the lining of the nose and make the nasal passages feel blocked. This can reduce smell temporarily, often with sneezing, an itchy nose, watery discharge, or congestion. Chronic sinusitis, a common cold, and COVID-19 can also affect smell. A change that continues after other nasal symptoms settle deserves assessment, especially if the loss is complete, affects one side, or comes with facial pain or repeated infections.

Notice when the change began and whether it follows exposure to dust, pollen, pets, or another trigger. Saline rinsing may ease mucus, provided the water and equipment are safe and clean. A pharmacist or clinician can advise whether an allergy treatment is suitable for you. Do not insert objects into the nose or use decongestant sprays for longer than directed. Read about Allergic Rhinitis and Loss of Smell for related guidance.

Arrange a medical review if smell loss persists, keeps returning, or is not explained by a blocked nose. Seek prompt care for severe headache, swelling around an eye, high fever, confusion, or a stiff neck. Consider testing and medical advice if smell loss begins with symptoms suggestive of COVID-19, and mention any previous infection when discussing Long COVID.

Ask whether your pattern fits allergy-related inflammation, whether you need an examination for sinus disease, and which treatment is safe with your other medicines. Ask how to protect yourself from household hazards when you cannot smell smoke or spoiled food.