The sense of smell plays an important role in enjoying food, detecting environmental
hazards, and enhancing overall quality of life. Loss of smell, known as anosmia, can occur
suddenly or gradually and may affect one or both sides of the nose.
Because smell contributes significantly to the perception of flavor, many people with smell loss
also notice a reduced ability to taste foods.
Loss of smell can result from several conditions affecting the nasal passages, sinuses, or the
nerves responsible for smell.
Common Causes of Loss of Smell
Nasal Congestion or Inflammation
Inflammation inside the nose can block odor molecules from reaching the smell receptors.
Common causes include:
● Colds or viral infections
● Sinus infections
● Allergies
● Nasal polyps
When swelling improves, the sense of smell often returns.
Viral Infections
Certain viral illnesses can affect the smell receptors or the nerves responsible for smell. Some
patients experience smell loss following respiratory infections, including viruses that cause colds
or flu.
In many cases, smell gradually improves over time, although recovery may take several weeks
or months.
Nasal Polyps
Nasal polyps are benign growths inside the nasal passages or sinuses that can block airflow
and interfere with smell.
Head Injury
Trauma to the head can damage the nerves responsible for transmitting smell signals from the
nose to the brain.
Aging
The sense of smell may gradually decline with age.
Certain Medications
Some medications can affect smell perception in a small number of individuals.
Symptoms Associated With Smell Loss
People experiencing loss of smell may notice:
● Difficulty detecting odors
● Reduced enjoyment of food due to decreased flavor perception
● Trouble detecting smoke, gas, or spoiled food
● Changes in appetite
In some cases, smell loss may occur along with nasal congestion, sinus pressure, or nasal
blockage.
How Loss of Smell Is Evaluated
Evaluation typically includes a detailed examination of the nose and sinuses to identify
inflammation, polyps, or structural obstruction.
In some cases, additional testing may include:
● Nasal endoscopy to visualize deeper areas of the nasal passages
● Imaging studies of the sinuses
● Smell testing to assess the degree of smell loss
These evaluations help determine the underlying cause and guide treatment.
Treatment Options
Treatment depends on the cause of smell loss.
Possible approaches include:
● Treating nasal inflammation or allergies
● Nasal steroid sprays or medications
● Treatment of sinus infections
● Management of nasal polyps
● Smell training exercises in certain cases
Many patients experience improvement once inflammation or obstruction in the nose is treated.
When to Seek Evaluation
You should consider evaluation if you experience:
● Sudden loss of smell
● Persistent smell loss lasting several weeks
● Smell loss accompanied by nasal blockage or sinus symptoms
● Smell loss following a head injury
Early evaluation can help identify treatable causes and improve the chance of recovery.
Schedule a Consultation
If you are experiencing loss of smell or changes in your sense of smell, a consultation can help
determine the underlying cause and discuss treatment options to help restore normal smell
function.