Why does allergic rhinitis cause loss of smell?

Smelling depends on air carrying odour molecules to a small sensory area near the top of the nose. During an allergy flare, the nasal lining can become swollen and produce more mucus, narrowing that airflow path. Food may taste less noticeable because flavour also relies heavily on smell. Loss of Smell is a common presentation of Allergic Rhinitis.

A change in smell does not establish the cause. Colds, sinus problems, some medicines, head injury, and other conditions can affect smell as well. Note whether the change started suddenly, follows nasal congestion, or affects one side more than the other.

Limit contact with triggers you recognise and keep away from tobacco smoke. A saline rinse can clear mucus for some people when prepared and used safely. If you use a prescribed nasal spray, correct direction matters: aim slightly outwards toward the ear on the same side, rather than toward the middle wall of the nose.

Discuss ongoing congestion with a pharmacist or clinician before adding treatments. They can review whether allergy control is adequate and whether a different nasal problem should be considered. Take extra care with gas, smoke alarms, and spoiled food if your sense of smell is reduced.

Seek prompt medical assessment for a sudden loss of smell with facial weakness, severe headache, confusion, or after a head injury. Arrange a review for smell loss that persists, occurs mainly on one side, is accompanied by repeated nosebleeds, facial pain, or a nasal blockage that does not improve. A clinician can examine the nose and discuss likely causes.

Ask whether your pattern fits allergy-related congestion, whether your medicines could affect smell, and how long to try the recommended treatment before review. Mention changes in taste, sinus symptoms, injury, and any one-sided blockage.