What causes loss of smell?

Loss of smell can be caused by a number of factors. These include:

  • Blocked nasal passage
    This includes nasal polyps, a deviated septum or tumours.
  • Irritation in the lining of the nose
    This includes sinus infection, flu, allergies or congestion
  • Brain or nerve damage
    This may include a range of conditions including a brain injury, stroke, diabetes, viral infection and brain tumours.


How can it be treated?

Depending on the cause, it may be possible to use decongestants to treat nasal irritation. If an obstruction is causing loss of smell, surgery may be required.