Olfactory dysfunction refers to a reduced or lost ability to smell. This condition can result from various factors, including nasal obstructions, infections, or neurological disorders. Common types of olfactory dysfunction include hyposmia (reduced sense of smell) and anosmia (complete loss of smell). The impact of olfactory dysfunction can affect daily life, as it may hinder the ability to enjoy food, detect hazards like smoke or gas, and recognize certain scents. It can also be associated with conditions such as Alzheimer's disease or Parkinson's disease, highlighting its potential link to overall health.