Epiglottitis happens when the epiglottis — a small cartilage "lid" that covers the windpipe — swells. The swelling blocks the flow of air into the lungs. Epiglottitis can be deadly.

Many factors can cause the epiglottis to swell. These factors include infections, burns from hot liquids and injuries to the throat.

Epiglottitis can happen at any age. Once, mainly children got it. The most common cause of epiglottitis in children was infection with Haemophilus influenzae type b (Hib) bacteria. The bacterium also causes pneumonia, meningitis and blood infections.

Routine Hib vaccination for infants has made epiglottitis rare in children. It's now more common in adults. The condition needs quick care to prevent deadly complications.


Symptoms in children

Children can develop symptoms of epiglottitis within hours. Symptoms can include:

  • Fever.
  • Sore throat.
  • Unusual, high-pitched sound when breathing in, known as stridor.
  • Difficult and painful swallowing.
  • Drooling.
  • Acting anxious and irritable.
  • Sitting up or leaning forward to ease breathing.

Symptoms in adults

Adults might get symptoms over days rather than hours. Symptoms might include:

  • Sore throat.
  • Fever.
  • A muffled or hoarse voice.
  • Unusual, high-pitched sound when breathing in, known as stridor.
  • Difficulty breathing.
  • Difficulty swallowing.
  • Drooling.

When to see a doctor

Epiglottitis is a medical emergency. If you or someone you know suddenly has trouble breathing and swallowing, call your local emergency number or go to the nearest hospital emergency department. Try to keep the person quiet and upright, because this position can make it easier to breathe.


An infection or injury causes epiglottitis.


In the past, a common cause of swelling and inflammation of the epiglottis and surrounding tissues was infection with Haemophilus influenzae type b (Hib) bacteria. Hib is responsible for other conditions, the most common being meningitis. Hib is now much less common in developed countries where children get Hib vaccines.

Hib spreads when an infected person coughs or sneezes droplets into the air. It's possible to have Hib in the nose and throat without becoming sick. But spreading it to others is still possible.

In adults, other bacteria and viruses also can cause the epiglottis to swell. These include:

  • Streptococcus pneumoniae (pneumococcus). This bacterium can cause meningitis, pneumonia, ear infection and blood infection.
  • Streptococcus A, B and C. This group of bacteria can cause diseases from strep throat to blood infection.
  • Staphylococcus aureus. This bacterium causes skin infections and other diseases including pneumonia and toxic shock syndrome.


Rarely, physical injury, such as a blow to the throat, can cause epiglottitis. So can burns from drinking very hot liquids and breathing in smoke from a fire.

Symptoms like those of epiglottitis can come from:

  • Swallowing a chemical that burns the throat.
  • Swallowing an object.
  • Smoking drugs, such as crack cocaine.
  • Smoking electronic cigarettes.

Risk factors

Some factors increase the risk of getting epiglottitis, including:

  • Having a weakened immune system. An immune system weakened by illness or medicines can be more likely to get bacterial infections that may cause epiglottitis.
  • Not being fully vaccinated. Skipping vaccinations or not getting them on time can leave a child open to Haemophilus influenzae type b (Hib) and increase the risk of epiglottitis.


Epiglottitis can cause many complications, including:

  • Breathing failure. The epiglottis is a small, movable "lid" just above the larynx that prevents food and drink from entering the windpipe. Swelling of the epiglottis can completely block the airway.

    This can lead to breathing or respiratory failure. In this life-threatening condition, the level of oxygen in the blood drops very low.

  • Spreading infection. Sometimes the bacteria that cause epiglottitis cause infections in other parts of the body. Infections can include pneumonia, meningitis or a bloodstream infection.


Hib vaccine

Getting the Haemophilus influenzae type b (Hib) vaccine prevents epiglottitis caused by Hib. In the United States, children usually receive the vaccine in three or four doses:

  • At 2 months.
  • At 4 months.
  • At 6 months if the child is getting the four-dose vaccine.
  • At 12 to 15 months.

Because children older than 5 and adults are less likely to develop Hib infection, they're not usually given the vaccine. But the Centers for Disease Control and Prevention recommends the vaccine for older children and adults whose immune systems are weak because of:

  • Sickle cell disease.
  • Spleen removal.
  • Chemotherapy.
  • Medicine to prevent rejection of organ or bone marrow transplants.

Vaccine side effects

  • Allergic reaction. An allergic reaction requires swift medical attention. Though rare, an allergic reaction may cause difficulty breathing, wheezing, hives, weakness, a rapid heartbeat or dizziness within minutes or hours after the shot.
  • Possible mild side effects. These include redness, warmth, swelling or pain at the injection site, and a fever.

Commonsense precautions

The Hib vaccine isn't foolproof. Some vaccinated children have had epiglottitis — and other germs can cause epiglottitis too. That's where using common sense comes in:

  • Don't share personal items.
  • Wash hands frequently.
  • Use an alcohol-based hand sanitizer if soap and water aren't available.

Nov. 11, 2022
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  2. Woods CR. Epiglottitis (supraglottitis): Clinical features and diagnosis. https://www.uptodate.com/contents/search. Accessed Oct. 12, 2022.
  3. Woods CR. Epiglottitis (supraglottitis): Management. https://www.uptodate.com/contents/search. Accessed Oct. 12, 2022.
  4. Hib vaccination: What everyone should know. Centers for Disease Control and Prevention. https://www.cdc.gov/vaccines/vpd/hib/public/. Accessed Oct. 12, 2022.
  5. Haemophilus influenzae disease (including Hib). Centers for Disease Control and Prevention. https://www.cdc.gov/hi-disease/about/index.html. Accessed Oct. 13, 2022.


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