Laryngitis refers to inflammation of the larynx and can present in both acute and chronic forms. Acute Laryngitis is often a mild and self-limiting condition that typically lasts for a period of 3 to 7 days. If this condition lasts for over 3 weeks, then it is termed as chronic laryngitis.
The most common cause of acute laryngitis is viral upper respiratory infection (URI), and this diagnosis can often be obtained from taking a thorough history of present illness from the patient. In the absence of infectious history or sick contacts, additional causes of non-infectious laryngitis must be explored. Presenting symptoms often include voice changes (patients may report hoarseness or a "raspy" voice), early vocal fatigue (particularly in singers or professional voice users), or a dry cough. Breathing difficulties are rare (though possible) in acute laryngitis, but the presence of significant dyspnea, shortness of breath (SOB), or audible stridor should alert the clinician that a more dangerous disease process may be present. Suspicion should be heightened in smokers and the immunocompromised, as these patients are at higher risk for malignancy and more dangerous infections that may otherwise mimic acute laryngitis. Similarly, the presence of significant dysphagia, odynophagia, drooling, or posturing are very rare in simple acute laryngitis and warrant additional workup.
The etiology of acute laryngitis can be classified as either infectious or non-infectious. The infectious form is more common and usually follows an upper respiratory tract infection.
Viral agents such as rhinovirus, parainfluenza virus, respiratory syncytial virus, coronavirus, adenovirus, and influenza are all potential etiologic agents (listed in roughly descending order of frequency). It is possible for bacterial superinfection to occur in the setting of viral laryngitis, this classically occurs approximately seven days after symptoms begin.
The most commonly encountered bacterial organisms are Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, in that order. Exanthematous febrile illnesses such as measles, chickenpox, and whooping cough are also associated with acute laryngitis symptoms, so it is prudent to obtain an accurate immunization history. Laryngitis caused by fungal infection is very rare in immunocompetent individuals, and more often presents as chronic laryngitis in the immunocompromised or in patients using inhaled steroid medications.
Acute infectious laryngitis in adults is most commonly caused by the viral organisms listed above. These same agents are common in pediatric acute laryngitis, though it is important to remember croup (laryngotracheobronchitis) in children, which is due to parainfluenza virus (most commonly parainfluenza-1). This may present with isolated vocal symptoms, but classically includes a characteristic "barking" cough and may progress to inspiratory or biphasic stridor.
Acute non-infectious laryngitis can be due to vocal trauma/abuse/misuse, allergy, gastroesophageal reflux disease, asthma, environmental pollution, smoking, inhalational injuries, or functional/conversion disorders.
Vocal misuse or abuse can be acute in onset, as seen after a day or days of shouting/yelling. This is common in coaches, fans, and athletes after an event. This can also be seen in vocal performers, particularly those whose performance intensity or frequency has increased recently, and who have not had formal voice or singing coaching.
Gastroesophageal reflux (GERD), more specifically extra-esophageal GERD, termed laryngopharyngeal reflux (LPR), is an exceptionally common cause of voice symptoms and laryngitis. These symptoms can be acute or chronic and may be episodic. They may not follow or accompany the classic GERD symptoms, and 1/3 of patients with GERD will experience only laryngeal/voice symptoms. Hallmarks include a history of GERD, frequent throat-clearing or coughing, globus pharyngeus sensation, or coarseness to the voice. Singers may note a loss of their higher range.
Asthma may predispose to laryngitis due to chemical irritation from inhaler use, and chronic steroid inhaler use can predispose to fungal laryngitis, particularly if patients are not drinking plain water after their steroid inhaler use as instructed. There is also cough-variant asthma that may cause a repetitive injury to the vocal cords, leading to voice changes that mimic acute laryngitis.
Environmental causes such as seasonal and environmental allergies, or seasonal or constant air pollution, can cause irritation to the vocal cords that may trigger acute laryngeal symptoms.
Inhalation of noxious substances, whether intentional from smoking or other drug use or from unintentional exposure, irritates the larynx and can cause edema of the vocal folds and voice symptoms. Certain patients may be sensitive to perfumes, colognes, detergents, or other commonly-used aromatics in daily life.
Functional dysphonia is a term for a group of true conversion disorders and encompasses a wide range of voice symptoms and physical examination findings. This is a diagnosis of exclusion, but recent major life stressors such as loss of a job or loved one are well-known triggers.
Acute laryngitis can affect patients of any age, though is more common in the adult population, usually affecting individuals aged 18 to 40, though it may be seen in children as young as three. Isolated voice symptoms in children younger than three should prompt a more thorough workup for additional pathology including vocal cord paralysis, GERD, and neurodevelopmental conditions. Accurate incidence measurements of acute laryngitis remain difficult to elucidate as this condition remains under-reported, with many patients appropriately not seeking medical care for this often self-limited condition.
Acute laryngitis resolves within 2 weeks, and is due to local inflammation of the vocal folds and surrounding tissues in response to a trigger, whether that trigger is infectious or non-infectious. If symptoms persist beyond this timeframe it is either due to superinfection or due to a transition to chronic laryngitis.
Acute laryngitis is characterized by inflammation and congestion of the larynx in the early stages. This can encompass the supraglottic, glottic, or subglottic larynx (or any combination thereof), depending on the inciting organism. As the healing stage begins, white blood cells arrive at the site of infection to remove the pathogens. This process enhances vocal cord edema and affects vibration adversely, changing the amplitude, magnitude, and frequency of the normal vocal fold dynamic. As the edema progresses, the phonation threshold pressure can increase. The generation of adequate phonation pressure becomes more difficult, and the patient develops phonatory changes both as a result of the changing fluid-wave dynamics of the inflamed and edematous tissue, but also as a result of both conscious and unconscious adaptation to attempt to mitigate these altered tissue dynamics. Sometimes edema is so marked that it becomes impossible to generate adequate phonation pressure. In such a situation, the patient may develop frank aphonia. Such maladaptations may result in prolonged vocal symptoms after an episode of acute laryngitis that can persist long after the inciting event has resolved. In such situations, referral to an otolaryngologist and/or speech-language pathologist is warranted.
The evaluation of an acute laryngitis patient must always begin with a thorough history and physical examination. Special attention should be directed at recent URI or other illnesses, sick contacts, or any other signs of systemic illness. The physician should also explore past medical history including immune status, immunization status, allergy and travel history, and history of other confounding pathologies such as GERD. Special attention should be paid to the onset and duration of the symptoms, as well as if they have ever happened before. If the patient has been treated prior to presentation, the efficacy and nature of such treatment must be explored also.
Initial symptoms of acute laryngitis are usually abrupt in onset and worsen over two or three days, though may persist up to a week without treatment. These can include:
Diagnosis can usually be made based on history.
The examination of the larynx can confirm the diagnosis. Indirect examination of the airway with a mirror or with a flexible laryngoscope is warranted. Laryngeal appearance can vary with the severity of the disease. In the early stages, there is erythema and edema of the epiglottis, aryepiglottic folds, arytenoids, and vocal cords. As the disease progresses the vocal cords can become erythematous as well as edematous. The subglottic region may be involved, depending upon the inciting agent, though this is rarer. Sticky, ropy, secretions may also be seen between vocal cords or in the inter-arytenoid region. In the case of vocal abuse or misuse, several changes can be seen in the vocal folds. Reinke's edema is a common finding in both acute and chronic laryngitis. Submucosal hemorrhage may be seen in acute vocal trauma, or previously undiagnosed nodules or pseudo-nodules may be present. If left untreated, all of these can progress to chronic voice pathology.
Diagnosis is usually made via a very thorough history and physical examination. Formal voice analysis and fiberoptic laryngoscopy can be used to confirm the diagnosis in cases that are refractory to treatment or otherwise convoluted. Stroboscopy may be relatively normal or may reveal asymmetry, aperiodicity, and reduced mucosal wave patterns . Further imaging or laboratory studies are not required unless an atypical pathogen or neoplasm are suspected. Rarely, if the patient has exudate in the oropharynx or vocal cords, culture may be indicated.
Treatment is often supportive in nature and depends on the severity of laryngitis.
Fungal laryngitis can be treated with the use of oral antifungal agents such as fluconazole. Treatment is usually required for three weeks period and may be repeated if needed. This should be reserved for patients with confirmed fungal infection via laryngeal examination and/or culture.
Mucolytics like guaifenesin may be used for clearing secretions.
In addition to lifestyle and dietary modifications, LPR-related laryngitis is treated with anti-reflux medications. Medications that suppress acid production such as H2 receptor and proton pump blocking agents are effective against gastroesophageal reflux, though proton pump inhibitors are found to be most effective for LPR. These may require higher doses or twice-daily dosing schedule to be effective in this setting.
Prevailing data do not support the prescription of antihistaminics or oral corticosteroids for treating acute laryngitis.
As this is often a self-limiting condition, it carries a good prognosis. If the patient completes the recommended therapy, the prognosis for recovery to a premorbid level of phonation is excellent. If vocal maladaptations have occurred, a course of speech therapy can resolve these problems.
Acute laryngitis is often a self-limiting condition, but the clinician must be astute and attuned to potential underlying conditions or other problems that can mimic acute laryngitis. Any acute laryngitis that does not respond to appropriate treatment warrants further reconsideration, and potential referral to an otolaryngologist for a formal laryngeal examination. Voice rest is recommended. (Level 1) Antihistaminics and oral steroids have no role in treatment. (Level 1)
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