Voice Disorders: Structural, Neurogenic & Functional

Voice disorders are classified by cause: organic (structural), neurogenic, and functional (behavioral/muscle misuse). Most exam and clinical reasoning starts with the same question — is this tissue, nerve, or behavior?

Structural (organic) lesions

• Vocal nodules: bilateral, symmetric, callus-like lesions at the junction of the anterior and middle third of the vocal folds — the point of maximum contact. Caused by phonotrauma. Voice is hoarse and breathy with an hourglass glottal closure pattern. First-line treatment is behavioral, not surgical.
• Polyps: usually unilateral, often after a single traumatic event; sessile or pedunculated. May require surgery followed by voice therapy.
• Cysts: fluid-filled, within the lamina propria, typically unresponsive to behavioral therapy alone; usually surgical.
• Reinke's edema (polypoid degeneration): diffuse superficial lamina propria swelling strongly associated with smoking; produces abnormally low pitch, classically in women.
• Contact ulcers/granulomas: posterior glottis, associated with reflux, intubation, and hard glottal attack.
• Papilloma: HPV-related; recurrent respiratory papillomatosis in children can be airway-threatening.
• Laryngopharyngeal reflux: posterior laryngitis, morning hoarseness, globus, chronic throat clearing.

Neurogenic voice disorders

• Unilateral vocal fold paralysis: recurrent laryngeal nerve (branch of CN X) injury — thyroid surgery, cardiac surgery, intubation. Breathy voice, short maximum phonation time, weak cough, aspiration risk on thin liquids.
• Superior laryngeal nerve injury: cricothyroid weakness — loss of pitch range and vocal fatigue rather than gross breathiness.
• Spasmodic dysphonia: a focal laryngeal dystonia. Adductor type (strained-strangled, voice stoppages on vowels) is far more common; abductor type produces breathy breaks on voiceless consonants. Botulinum toxin injection is the standard treatment.
• Essential vocal tremor: rhythmic 4–7 Hz modulation, present on sustained vowels, often with head or hand tremor.
• Parkinson's hypophonia: reduced loudness and monopitch, treated with LSVT LOUD.

Functional and muscle tension disorders

Muscle tension dysphonia presents with excess extrinsic laryngeal tension, a high larynx, and often a posterior glottal chink — without structural pathology. Functional aphonia/dysphonia may show normal cough and laughter with absent conversational voice, a diagnostic clue. Puberphonia (mutational falsetto) is persistence of a high pitch after puberty and responds well to laryngeal reposturing techniques.

Assessment: the four-part standard

1. Perceptual: CAPE-V or GRBAS ratings of roughness, breathiness, strain.
2. Acoustic: fundamental frequency, jitter, shimmer, harmonics-to-noise ratio, cepstral peak prominence.
3. Aerodynamic: maximum phonation time, subglottal pressure estimates, airflow rate, s/z ratio (>1.4 suggests laryngeal pathology).
4. Visual: laryngeal videostroboscopy — mucosal wave, glottal closure pattern, symmetry, periodicity.

A patient-reported outcome measure (VHI-10, V-RQOL) belongs in every voice evaluation. And the rule that appears constantly on exams: an SLP may not begin voice therapy without a laryngeal examination by a physician — persistent hoarseness beyond two weeks requires ENT referral to rule out malignancy.

Treatment approaches

Physiologic programs treat the voice system as a whole: Resonant Voice Therapy (forward oral vibratory focus), Vocal Function Exercises(warm-up, stretch, contract, power), semi-occluded vocal tract exercises such as straw phonation, and Accent Method for breath-voice coordination. Symptomatic techniques target one parameter: yawn-sigh, chant talk, easy onset, chewing. Vocal hygiene alone is rarely sufficient as a standalone plan.

Alaryngeal voice after laryngectomy

Three options: tracheoesophageal puncture with a voice prosthesis (best fluency and intelligibility, the current standard), esophageal speech(injection or inhalation methods, no device, harder to learn), and the electrolarynx (fastest to acquire, mechanical quality). Post-laryngectomy patients breathe through a stoma and lose nasal airflow — expect anosmia and altered pulmonary humidification. See head and neck cancer management for the fuller picture.