The most common cause of acute laryngitis is
Viral upper respiratory infection
Coughing-induced laryngitis may also occur in bronchitis, pneumonia, influenza, pertussis, measles, and diphtheria. Excessive use of the voice (especially with loud speaking or singing), allergic reactions, gastroesophageal reflux, bulimia, or inhalation of irritating substances (eg, cigarette smoke or certain aerosolized drugs) can cause acute or chronic laryngitis. Drugs can induce potentially life-threatening laryngeal edema, for example, as a side effect of angiotensin-converting enzyme (ACE) inhibitors. Bacterial laryngitis is extremely rare. Smoking can cause Reinke edema, which is a watery swelling of both vocal cords.
(See also Overview of Laryngeal Disorders Overview of Laryngeal Disorders The larynx contains the vocal cords and serves as the opening to the tracheobronchial tree. Laryngeal disorders include Benign laryngeal tumors Contact ulcers Laryngitis Laryngoceles read more .)
Symptoms and Signs of Laryngitis
The most prominent symptom of laryngitis is usually
An unnatural change of voice
Volume is typically greatly decreased; some patients have aphonia. Hoarseness, a sensation of tickling, rawness, and a constant urge to clear the throat may occur. Symptoms vary with the severity of the inflammation.
Fever, malaise, dysphagia, and throat pain may occur in more severe infections. Laryngeal edema, although rare, may cause stridor and dyspnea.
Diagnosis of Laryngitis
Sometimes indirect or direct laryngoscopy
Diagnosis of laryngitis is based on symptoms.
Indirect or direct flexible laryngoscopy is recommended for symptoms persisting > 3 weeks; findings in laryngitis include mild to marked erythema of the mucous membrane, which may also be edematous. With reflux, there is swelling of the inner lining of the larynx and redness of the arytenoids.
If a pseudomembrane is present, diphtheria is suspected.
Treatment of Laryngitis
Symptomatic treatment (eg, cough suppressants, voice rest, steam inhalations)
No specific treatment is available for viral laryngitis.
Cough suppressants, voice rest, and steam inhalations relieve symptoms and promote resolution of acute laryngitis. Smoking cessation and treatment of acute or chronic bronchitis may relieve laryngitis.
Depending on the presumed cause, specific treatments to control gastroesophageal reflux, bulimia, or drug-induced laryngitis may be beneficial.