Hoarseness: What Could Be Causing It

What Hoarseness Actually Means

Hoarseness describes a perceived change in voice quality: roughness, breathiness, strain, or altered pitch. The clinical term is dysphonia. It is not a diagnosis. It is a symptom pointing to disrupted vibration of the vocal folds or abnormal airflow through the glottis 1.

Normal phonation requires both vocal cords to close symmetrically while exhaled air passes through, producing mucosal wave vibrations between 100 and 300 times per second in conversational speech. Any process that changes the mass, tension, shape, or mobility of the vocal folds can produce a hoarse voice. A 2012 prevalence study by Cohen et al. (N=36,935 U.S. households) found that 29.9% of adults reported at least one episode of dysphonia during their lifetime, yet only 6.2% of those affected sought medical evaluation 2. That gap matters because persistent hoarseness occasionally signals serious pathology hiding behind what feels like a minor annoyance.

The differential is broad. It spans infections, inflammatory conditions, benign structural lesions, neurological disorders, malignancy, and medication effects. Sorting through it requires a systematic approach rather than guesswork.

Acute Causes: Infections and Vocal Strain

Most episodes of hoarseness resolve on their own within two weeks. Acute viral laryngitis and vocal overuse account for the overwhelming majority.

Upper respiratory tract viruses (rhinovirus, influenza, parainfluenza, adenovirus, SARS-CoV-2) inflame the laryngeal mucosa and cause edema of the vocal folds. The result is a rough, lower-pitched voice that typically peaks around day three of illness and clears within 7 to 14 days 3. Bacterial laryngitis is rare in adults. Antibiotics provide no benefit for uncomplicated viral laryngitis, a point the AAO-HNS Clinical Practice Guideline on Hoarseness emphasizes explicitly: "Clinicians should not routinely prescribe antibiotics to treat dysphonia" 1.

Vocal overuse or misuse (shouting at a concert, prolonged lecturing, coaching without amplification) causes mechanical trauma to the vocal fold epithelium. Short-term effects include mucosal hemorrhage and edema. Voice rest for 24 to 48 hours, hydration, and avoidance of whispering (which paradoxically increases strain) are the standard first-line measures.

Acute laryngitis from chemical irritant inhalation (smoke, industrial fumes, recreational vaping) can produce sudden hoarseness with associated cough. Workplace exposures should be documented because occupational dysphonia qualifies for evaluation under OSHA guidelines.

Gastroesophageal Reflux and Laryngopharyngeal Reflux

Reflux is the most over-diagnosed and under-proven cause of chronic hoarseness. Separating real reflux-related dysphonia from empiric labeling requires objective testing.

Laryngopharyngeal reflux (LPR) differs from classic gastroesophageal reflux disease (GERD). Patients with LPR often have no heartburn. Instead, they report throat clearing, globus sensation, postnasal drip, and voice fatigue. Posterior laryngeal erythema and edema visible on laryngoscopy are suggestive but nonspecific. A 2020 systematic review by Lechien et al. found that laryngoscopic signs attributed to LPR were present in 70% to 80% of asymptomatic controls, raising questions about diagnostic accuracy 4.

Dr. James Koufman, who coined the term "LPR," has stated: "The diagnosis of reflux-related voice disorders should never be made on laryngoscopy findings alone. Ambulatory pH monitoring is the only way to confirm that acid reaches the larynx." The AAO-HNS guideline recommends against prescribing empiric anti-reflux medication for dysphonia without first visualizing the larynx 1.

When LPR is confirmed, treatment includes twice-daily proton pump inhibitor (PPI) therapy for a minimum of 8 to 12 weeks, dietary modification (avoiding acidic foods, caffeine, and late-night eating), and head-of-bed elevation. Response is gradual. Voice improvement may not appear until 6 to 8 weeks into treatment, and roughly 40% of patients with presumed LPR-related hoarseness do not respond to PPI therapy at all 5.

Benign Structural Lesions of the Vocal Cords

Vocal cord nodules, polyps, and cysts are the leading structural causes of chronic hoarseness in adults who use their voice professionally.

Nodules ("singer's nodes") are bilateral, callous-like lesions at the junction of the anterior one-third and posterior two-thirds of the vocal fold. They result from chronic phonotrauma. A study published in the Journal of Voice found that nodules account for approximately 17% to 24% of benign vocal fold lesions identified on stroboscopy in voice clinics 6. Nodules are more common in women and in prepubertal boys. The voice is typically breathy and lower-pitched.

Polyps are usually unilateral, arising from a single episode of vocal trauma (a hemorrhagic event during forceful phonation). They may be sessile or pedunculated. Reinke's edema, a diffuse polypoid degeneration of both vocal folds, is strongly associated with cigarette smoking and hypothyroidism.

Treatment depends on the lesion. Voice therapy with a speech-language pathologist is first-line for nodules and resolves them in approximately 50% of cases without surgery 3. Polyps and cysts more often require microsurgical excision. The AAO-HNS guideline recommends voice therapy before or instead of surgery for nodules and recommends against surgical intervention without a trial of conservative management 1.

Medication-Induced Dysphonia

Several drug classes can cause hoarseness. Inhaled corticosteroids are the most common offender, but the list extends well beyond them.

Inhaled corticosteroids (ICS), including fluticasone, budesonide, and beclomethasone, cause dysphonia in 5% to 58% of users depending on the formulation, device type, and dose 7. The mechanism involves local steroid myopathy of the vocalis muscle and mucosal candidiasis. Dry powder inhalers produce higher rates of dysphonia than metered-dose inhalers with spacers. Simple interventions help: rinsing the mouth and gargling after each dose, using a spacer device, and switching to a lower-deposition formulation. Patients who develop persistent dysphonia on ICS should not simply be told their voice change is "normal." Laryngoscopy is warranted to exclude candidiasis or an unrelated lesion.

Other medications that cause voice changes include:

• Angiotensin-converting enzyme (ACE) inhibitors (captopril, lisinopril): cough-mediated vocal fold irritation plus direct mucosal drying.
• Antihistamines and anticholinergics: drying of the laryngeal mucosa reduces vocal fold lubrication.
• Bisphosphonates (alendronate): chemical laryngitis from esophageal reflux of the tablet.
• Testosterone therapy: exogenous androgens lower vocal pitch irreversibly in women by thickening the vocal folds. This is a recognized effect of both intramuscular testosterone and compounded testosterone creams 8.
• Inhaled anticholinergics (tiotropium, ipratropium): mucosal drying, reported in up to 11% of tiotropium users 9.

A thorough medication reconciliation is part of every hoarseness evaluation.

Vocal Cord Paralysis and Neurological Causes

Unilateral vocal cord paralysis (UVCP) produces a breathy, weak voice and sometimes aspiration with liquids. It is a sign, not a diagnosis. The underlying cause must be identified.

The recurrent laryngeal nerve, a branch of the vagus nerve, innervates the vocal cord muscles. Any process along the nerve's long path (skull base to aortic arch, then back up to the larynx) can cause paralysis. In a retrospective series of 389 patients with UVCP published in The Laryngoscope, the most common etiologies were surgical injury (primarily thyroidectomy, 36%), idiopathic (18%), and malignancy (18%) 10. Malignant causes included lung carcinoma, thyroid carcinoma, and esophageal carcinoma.

The AAO-HNS guideline states: "Clinicians should perform, or refer to a clinician who can perform, laryngoscopy to visualize the vocal folds in any patient with dysphonia that does not resolve within 4 weeks or is not attributable to an obvious benign cause" 1.

Bilateral vocal cord paralysis is less common but far more dangerous, potentially causing airway obstruction. Patients present with stridor and dyspnea rather than isolated hoarseness.

Other neurological causes include:

• Parkinson disease: a breathy, monotone, low-volume voice (hypophonia) is often one of the earliest symptoms, sometimes preceding motor signs by years.
• Essential tremor: produces a rhythmic wavering of the voice.
• Myasthenia gravis: voice fatigues progressively during conversation.
• Spasmodic dysphonia: a focal laryngeal dystonia causing involuntary spasms of the vocal folds during speech.

Laryngeal Cancer and Other Malignancies

Persistent hoarseness in a smoker over age 50 is laryngeal cancer until proven otherwise. Early glottic carcinoma has a high cure rate when caught promptly.

Squamous cell carcinoma of the glottis accounts for the majority of laryngeal cancers. Hoarseness is the presenting complaint in roughly 70% of cases because even a small tumor on the vocal fold disrupts the mucosal wave 11. Major risk factors are tobacco use and alcohol consumption, with a multiplicative (not merely additive) interaction between the two. The 5-year survival rate for stage I glottic carcinoma treated with radiation alone exceeds 90%, but drops below 50% for stage IV disease 12.

Supraglottic cancers present later because they do not directly involve the vocal folds. Symptoms include dysphagia, referred ear pain (otalgia), and a neck mass before voice changes appear.

Warning signs that demand urgent laryngoscopy:

• Hoarseness lasting longer than 4 weeks, especially in a current or former smoker.
• Unexplained weight loss with voice change.
• Dysphagia or odynophagia accompanying hoarseness.
• Hemoptysis.
• Unilateral ear pain without otologic findings.
• A palpable neck mass.

Any of these findings should trigger referral to an otolaryngologist within 2 weeks. The United Kingdom's NICE guidelines designate hoarseness persisting beyond 3 weeks in a smoker as a "two-week wait" referral criterion for suspected cancer 13.

Thyroid Disease and Systemic Conditions

Hypothyroidism causes vocal fold edema and Reinke's space fluid accumulation, producing a characteristically deep, gravelly voice. In a cross-sectional study of 149 hypothyroid patients, 52.3% had objective voice abnormalities on acoustic analysis, and these largely normalized with levothyroxine replacement 14.

Thyroid surgery carries a well-documented risk of recurrent laryngeal nerve injury. Temporary hoarseness occurs in 5% to 10% of thyroidectomies. Permanent vocal cord paralysis occurs in approximately 1% to 2% 15. Pre-operative and post-operative laryngoscopy is recommended by the American Thyroid Association for all patients undergoing thyroid surgery.

Other systemic conditions associated with hoarseness:

• Rheumatoid arthritis: cricoarytenoid joint arthritis can restrict vocal fold mobility.
• Amyloidosis: deposits in the laryngeal tissue cause progressive hoarseness.
• Sarcoidosis: granulomatous involvement of the larynx occurs in up to 5% of patients with systemic sarcoidosis.
• Wegener granulomatosis (granulomatosis with polyangiitis): subglottic stenosis and laryngeal ulceration.

How Hoarseness Is Diagnosed

The diagnostic workup follows a step-wise approach. History and laryngoscopy are the two pillars.

A focused voice history includes: duration of symptoms, onset pattern (sudden versus gradual), associated symptoms (dysphagia, odynophagia, weight loss, heartburn, cough), voice use patterns, smoking history, and a complete medication review. The Voice Handicap Index-10 (VHI-10) is a validated 10-item questionnaire that quantifies the patient's perceived severity 1.

Flexible fiberoptic laryngoscopy is the standard first examination. Performed in the office with topical anesthesia, it provides direct visualization of the vocal folds and surrounding structures. Stroboscopy adds a strobe-light source that creates a slow-motion view of the mucosal wave, revealing subtle lesions and vibratory asymmetries invisible on standard exam.

Additional investigations depend on the findings:

• CT or MRI of the neck and chest: ordered when malignancy, vocal cord paralysis without an obvious cause, or a deep-space mass is suspected.
• Ambulatory dual-probe pH monitoring: confirms or excludes LPR when reflux-related dysphonia is suspected but unresponsive to empiric therapy.
• Laryngeal electromyography (LEMG): differentiates vocal fold paralysis from arytenoid fixation and provides prognostic information about nerve recovery.
• Thyroid function tests: TSH and free T4 if hypothyroidism is suspected.

Treatment Options by Cause

Treatment is cause-specific. There is no universal "hoarseness medication."

For acute viral laryngitis: voice rest, hydration, humidification, and avoidance of irritants. Oral corticosteroids are not routinely recommended but may be considered for professional voice users who have an imminent performance. A Cochrane review found limited evidence supporting corticosteroids for acute laryngitis in the general population 16.

For benign vocal fold lesions: voice therapy is first-line. Surgery (microlaryngoscopy with excision) is reserved for lesions that fail conservative management or where biopsy is needed to exclude dysplasia.

For vocal cord paralysis: options include voice therapy, injection laryngoplasty (temporary filler such as hyaluronic acid or calcium hydroxylapatite injected into the paralyzed fold to medialize it), and thyroplasty (a permanent implant placed through a window in the thyroid cartilage). Timing depends on prognosis for nerve recovery. Injection laryngoplasty can be performed in the office under local anesthesia and provides immediate voice improvement lasting 2 to 6 months 10.

For spasmodic dysphonia: botulinum toxin injection into the affected laryngeal muscles is the gold standard, typically repeated every 3 to 6 months.

For muscle tension dysphonia: laryngeal manual therapy and voice therapy with a speech-language pathologist yield improvement in 70% to 90% of cases 3.

The four-week rule is the clearest clinical instruction: if your voice has not returned to normal within four weeks, schedule a laryngoscopy. Do not wait longer.