Anosmia is the loss of the sense of smell, which can occur due to various reasons, including nasal obstructions, infections, or neurological conditions. It can significantly impact a person's quality of life, as smell is closely linked to taste and can affect appetite and enjoyment of food. This condition can be temporary or permanent, depending on its cause. Anosmia can also be associated with other sensory disorders, such as ageusia, the loss of taste. In some cases, it may be a symptom of underlying health issues, including COVID-19 or Alzheimer's disease.