Hyposmia and Anosmia

COVID-19 Update:


Century is committed to keeping our patients safe.  We're following the recommendations of the Centers for Disease Control and Illinois Department of Public Health.  This includes social distancing, using TeleMedicine virtual visits and scheduling patients by priority.  To reduce the volume in our waiting room and the potential risk of infection, we will be migrating towards pre-screened urgent health visits or TeleHealth visits.   We appreciate your understanding as we work to increase our capacity while keeping you safe.

If you are sick, have a fever, a newly presented dry cough, have travelled internationally, please do not visit the office.  Instead, call us to setup a TeleMedicine visit, or contact your Primary Care Physician for further instruction.  Century is not able to provide screening or testing for COVID-19. 

If you present with Ansomia (loss of smell) or Ageusia (Loss of taste), Have been COVID-19 Positive within the past 4 weeks, or have been in direct contact with someone who has tested positive, please do not enter the practice.  Let us know and we can recommend a Telemedicine visit.


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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.

What Are the Symptoms of Hyposmia or Anosmia?

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.

What Causes Hyposmia or Anosmia?

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.

What Are the Treatment Options?

Treatment for hyposmia or anosmia starts with figuring out the cause, so seeing an ENT specialist about these conditions is very important, starting with a thorough medical history and nasal exam. This may include a CT scan or MRI of the nose and sinuses. Specialized smell tests can help determine how much loss of smell you may have experienced.

After looking for the cause, your ENT specialist may decide to treat a nasal inflammation or obstruction. This may involve topical and/or oral medications to reduce inflammation, antibiotics, or surgery inside the nose. 

Treatment for permanent loss of smell includes environmental safety recommendations and proper chemical detectors (gas and carbon monoxide) in the home. It also may include nasal rinses, smell retraining therapy, and certain supplements that may be helpful.

What Questions Should I Ask My Doctor?

  1. Why did my sense of smell change?
  2. What lab or radiology tests do you recommend?
  3. What medications can I take to try to improve or recover my sense of smell?
  4. Could I have chronic sinusitis?
  5. Is my hyposmia or anosmia related to other possible conditions?


Copyright 2021. American Academy of Otolaryngology–Head and Neck Surgery Foundation. Last reviewed April 2020.