Smell Disorders

Hyposmia is a decreased sense of smell, or a decreased ability to detect odors through your nose. Anosmia is the inability to smell anything. These conditions are not very common.

Smell is one of our most basic, important senses, and has meaning in our lives when it comes to enjoying a new sensation, remembering past experiences, and even detecting potentially dangerous odors such as smoke or spoiled milk. Loss of smell is a health condition that should be evaluated and treated by an ENT (ear, nose, and throat) specialist, or otolaryngologist.

Symptoms

Symptoms of hyposmia or anosmia may be noticed gradually or suddenly, and include:

• Decreased or absent sense of smell

• Decreased sense of taste (flavor is the combination of taste and smell)

• Nasal blockage or congestion

• Nasal inflammation

• Respiratory infection

Losing the ability to smell can often be accompanied by symptoms of chronic sinusitis, which may include frequent infections, facial pressure and pain, nasal obstruction, and drainage. Decreased sense of smell should not be painful or uncomfortable. Since tasting food and beverages is strongly related to the sense of smell, hyposmia or anosmia may also lead to a decreased desire to eat and drink.

Causes

The most common cause of acute or sudden smell loss is nasal blockage. Having inflammation in the nose from a cold, allergies, or an upper respiratory tract infection can cause swelling, which blocks smell particles from reaching the top of the nasal cavity where the smell, or olfactory, nerve is located. It is normal to have decreased or loss of smell during an active cold or sinus infection. However, it is less common to have decreased sense of smell when you’re not feeling ill.

Experiencing hyposmia or anosmia over a long period of time may indicate chronic sinus infection with or without nasal polyps. It may be due to an obstruction in the nose, such as a deviated septum, tissue swelling or, rarely, tumors of the nasal cavity. Nasal trauma can cause a loss of smell, either from a new blockage or from damage to the olfactory nerve. Many cases also occur after a viral infection and can be permanent.

Lastly, people often experience a decrease in their sense of smell as a part of normal aging. This is gradual, usually starting after age 65, but it can be sped up by cigarette smoking or chronic nasal inflammation. If you have decreased sense of smell along with memory loss or difficulty walking, tremors, and speech issues, you should tell your primary care provider about these symptoms right away.