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Some people are born with a poor sense of smell or taste. Upper respiratory infections are blamed for some losses, and injury to the head can also cause smell or taste problems. Loss of smell and taste may result from polyps in the nasal or sinus cavities, hormonal disturbances, or dental problems.
When we lose our sense of smell with a cold itâs because congestion restricts airflow to the top of the nose, stopping those microscopic particles going up the nostril. This is temporary, but damage to the sensory cells or the smell area in the brain can cause a lasting loss. âCauses can include head injury, or more rarely Parkinsonâs or Alzheimerâs. But often itâs down to more mundane causes,â says Mr Philpott.