Laryngitis is swelling and inflammation of the larynx. It can be acute or chronic, although in most cases the condition is temporary and has no serious consequences.

The larynx, also referred to as the voice box, is home to the vocal cords. These are vital to the processes of breathing, swallowing, and talking. The vocal cords are two small folds of mucous membrane covering cartilage and muscle that vibrate to produce sound.

In a 2013 study of people in the United States (U.S.), 3.47 in every 1,000 people had a diagnosis of chronic laryngitis. It is thought that 21 percent of the population may develop chronic laryngitis in their lifetime.

Laryngitis is not often serious and in most cases resolves without treatment in around 7 days.

Fast facts on laryngitis

  • Viral infections such as colds are the most common causes of laryngitis.
  • Chronic laryngitis is often caused by lifestyle factors, such as ongoing exposure to irritants.
  • Children with laryngitis can develop another respiratory illness called croup.
  • A doctor may recommend additional testing in more severe cases, such as a laryngoscopy.
  • Acute laryngitis is best treated with self-care measures and rest.

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Laryngitis is an infection of the vocal cords.

Laryngitis is an inflammation of the vocal cords.

The vocal cords normally open and close to generate the voice with a slow, steady movement. When a person has laryngitis, their vocal cords are swollen. This changes the way air moves through the throat.

This change in airflow leads to a distortion of the sounds that the vocal cords produce. People with laryngitis will often have a voice that is hoarse, gravelly, or too quiet to hear properly.

In chronic laryngitis, the inflammation is ongoing. Vocal cords can become strained and develop growths, such as polyps or nodules.

Laryngitis can cause a wide range of symptoms in adults, including:

  • hoarseness
  • difficulty with speech
  • throat pain
  • low fever
  • persistent cough
  • frequent throat clearing

These symptoms begin suddenly and often become more severe over the next 2 to 3 days. If symptoms last for more than 3 weeks, it is likely that the case has become chronic. This suggests a more serious underlying cause that warrants further investigation.

Laryngitis often relates to other illnesses. Tonsilitis, throat infection, cold, or flu can occur alongside a case of laryngitis, so the following symptoms may also occur:

  • headache
  • swelling in the glands
  • runny nose
  • pain while swallowing
  • fatigue and malaise

The symptoms are likely to resolve without treatment by the seventh day of infection. See a doctor if the symptoms persist for longer or present severely.

Symptoms in children

Symptoms of laryngitis in children can differ from symptoms in adults. The condition is often characterized by a hoarse, barking cough and fever, and may also present as croup.

Croup is a contagious respiratory illness common among children. Although croup is usually a simple illness to treat, severe cases require medical attention.

Medical attention is recommended for children experiencing any of the following symptoms:

  • difficulty with breathing or swallowing
  • a fever of over 103° Fahrenheit or 39.4° Celsius
  • drooling
  • loud, high-pitched breathing sounds when inhaling

These symptoms can also indicate epiglottitis. This is inflammation of the tissue surrounding the trachea, or windpipe. Both adults and children can develop epiglottitis, and the condition can be life-threatening in certain cases.

A number of conditions can cause laryngitis. Acute and chronic forms of laryngitis typically result from different factors.

Acute laryngitis

The most common cause of laryngitis is a viral infection, often similar to those that cause the common cold or flu. Overuse of the voice can also cause inflammation of the larynx. Examples of overuse include loud singing or excessive shouting.

In very rare instances, acute laryngitis can be caused by diphtheria, a bacterial infection. Most people in the U.S. have received a diphtheria immunization.

Chronic laryngitis

Chronic laryngitis is typically caused by the following:

  • acid reflux, a condition in which stomach acid and contents are brought back up into the throat
  • bacterial, fungal, or parasitic infection
  • chronic sinusitis
  • excessive coughing
  • exposure to inhaled irritants, such as allergens or toxic fumes
  • high alcohol intake
  • habitual misuse or overuse of voice
  • smoking, including secondhand smoke
  • use of inhaled steroid medicines, such as asthma inhalers

Physicians typically diagnose laryngitis with a physical examination that assesses the ears, nose, throat, and voice. In most case, no additional testing is required.

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Laryngitis is normally diagnosed after a physical examination.

The most common symptom of the condition is hoarseness, so doctors will take care to listen to the voice of the person with laryngitis. They may also ask questions about lifestyle, potential exposure to airborne irritants, and other related diseases.

If a person presents with chronic hoarseness, a doctor may recommend additional testing to fully examine the vocal cords. Chronic hoarseness can be caused by other conditions, such as a cancer in the throat area. This symptom will require follow-up tests to rule out a more serious illness.

A laryngoscope can be used to observe the motion of the vocal cords when in use and determine the presence of any polyps or nodules on the vocal cords. A biopsy can be carried out if a suspicious area of tissue requires further assessment.

Anyone with symptoms that last longer than 2 weeks should consult their physician. In some cases, a doctor may refer the person with laryngitis to an otolaryngologist, also known as an ear, nose, and throat (ENT) specialist.

Cases of acute laryngitis are often best treated with rest, home remedies, and self-care measures that can relieve symptoms.