Laryngitis: Causes, Symptoms & Treatment

laryngitis, larynx, endoscopy, voice box, vocal cords, laryngoscopy, laryngitis symptoms, treatment causes
(Image credit: Laryngitis image via Shutterstock)

Laryngitis is inflammation (-itis) of the larynx (-laryn). The larynx is also known as the "voice box" because it contains the vocal cords, which are necessary for speech. Located in the throat above the trachea, or windpipe, the vocal cords open and close to create sound.

Symptoms and causes

Many people think that laryngitis is simply losing your voice; however, voice loss is actually a symptom. "Laryngitis is inflammation of the vocal cords. This swelling leads to changes in the voice or complete loss of voice," Dr. Stacey Silvers of the Madison Skin and Laser Center in New York, told Live Science.

Sometimes, the swelling becomes so bad that the throat becomes blocked, according to the National Institutes of Health (NIH). Speech may also be hoarse, or not possible at all. The throat may feel sore and itchy, as if it needs to be cleared. The patient may also get a fever.

These symptoms typically appear within hours or days of developing a cold or upper respiratory infection such as bronchitis or pneumonia. Colds, which are caused by viruses, are the most common cause of laryngitis. Other viral causes include measles. Although rare, bacterial infections, such as diphtheria, can also cause laryngitis.

Certain activities may strain the vocal cords to cause inflammation and lead to laryngitis. Examples of these types of activities include yelling at a sporting event or concert and working as a professional singer.

Silvers points out that all causes of laryngitis cause hoarseness, but not all hoarseness is laryngitis. Vocal polyps (seen in smokers and people with chronic acid reflux), nodules (from years of improper vocal use), tumors (benign or malignant) and trauma to the outside of the neck can cause inflammation or fracture of the laryngeal cartilage, leading to hoarseness. Patients can have vocal neurological issues, as well, that can lead to parasthesia or vocal weakness. For example, Parkinson's patients often have hoarseness, with vocal tremor and nerve paralysis. Anything that irritates, inflames, blocks or weakens the vocal bands (cords), will lead to hoarseness, Silvers said.

When laryngitis persists for three or more weeks, it is considered chronic. Bulimia, alcohol abuse and smoking, gastroesophageal reflux disease (GERD or acid reflux) and sinusitis cause chemicals to come in repeated contact with the vocal cords, which damages the cords over time.

Symptoms such as fever, difficulty swallowing, high-pitched breathing noises and more drooling than normal in children should be taken seriously. They may be signs of croup, which is a life-threatening condition. Parents should get the child immediate medical attention, according to the Mayo Clinic.

Diagnosis and tests

Laryngitis is diagnosed through a physical examination. A physician will listen to the sound of the voice, and in a technique called laryngoscopy, she will use a small mirror and a light to peer at the back of throat. Redness and swelling are typically visible.

A newer, slightly more invasive procedure called endoscopy is sometimes used to make a diagnosis. Endoscopy allows the physician to view the vocal cords in motion. In this procedure, a doctor uses a skinny, bendable tube called an endoscope that is equipped with a mini camera and light at its end. The physician inserts the endoscope in the nose or mouth and it extends into the throat. For individuals with chronic laryngitis, testing for cancer may be recommended.

Treatment and medication

Laryngitis is usually not serious. Resting the vocal cords and avoiding irritants can often resolve symptoms. In some cases, cough suppressants or antibiotics (if the infection is bacterial) may be prescribed.

Corticosteroids may also be described for infants with laryngitis related to croup or to adults who need to speak for work or other urgent matters. "Steroids can reduce inflammation as well, as long as the underlying problem is addressed," said Silvers.

Alternative and at-home therapies

Staying hydrated and avoiding harsh fluids like alcohol and caffeine will also promote healing. In addition to drinking fluids, sore-throat lozenges, salt water and gum, all of which increase the production of saliva, can relieve itchiness in the throat. Breathing moist air from a humidifier or even a hot shower can also relieve symptoms.

Things to avoid are any activities that dry out the nose, mouth and throat. For example, decongestants, like those found in over-the-counter products taken for a runny nose, can further aggravate the vocal cords.

Don't whisper!

Many think that whispering is the key to healing when afflicted with laryngitis. According to the Mayo Clinic, whispering can make symptoms worse as it causes more strain on vocal cords than speaking normally. Still, although individuals are encouraged to talk in a normal voice, both talking and singing should be kept to a minimum to give the vocal cords time to heal.

Additional resources

Alina Bradford
Live Science Contributor
Alina Bradford is a contributing writer for Live Science. Over the past 16 years, Alina has covered everything from Ebola to androids while writing health, science and tech articles for major publications. She has multiple health, safety and lifesaving certifications from Oklahoma State University. Alina's goal in life is to try as many experiences as possible. To date, she has been a volunteer firefighter, a dispatcher, substitute teacher, artist, janitor, children's book author, pizza maker, event coordinator and much more.