Dysphonia Defined - Hoarse Whisperings
- Dysphonia: Any abnormality in voice quality (e.g., hoarse, breathy, strained).
- Larynx Anatomy Essentials:
- Cartilages: Thyroid, cricoid, arytenoids (paired), epiglottis.
- Intrinsic Muscles:
- Thyroarytenoid (Vocalis): Body of vocal fold; shortens/relaxes (tensor/adductor).
- Posterior Cricoarytenoid (PCA): Sole abductor. 📌 PCA: 'Party Cord Opener'.
- Others: Lateral cricoarytenoid, interarytenoid (adductors); Cricothyroid (tensor, SLN).
- Nerve Supply:
- Recurrent Laryngeal Nerve (RLN): All intrinsic muscles except cricothyroid; sensory below vocal cords.
- Superior Laryngeal Nerve (SLN): External branch (motor to cricothyroid); Internal branch (sensory above vocal cords).
- Physiology of Phonation:
- Myoelastic-Aerodynamic Theory: Vocal fold vibration results from a balance of muscle tension (myoelastic properties) and aerodynamic forces (Bernoulli effect of exhaled air).

⭐ The posterior cricoarytenoid (PCA) muscle is the sole abductor of the vocal cords, innervated by the recurrent laryngeal nerve (RLN).
Etiology Spectrum - Why So Hoarse?
- Organic Causes:
- Inflammatory: Acute/Chronic Laryngitis
- Structural: Nodules, Polyps, Cysts, Reinke's, Granuloma, Sulcus, Web, Cancer
- Traumatic: Intubation/External trauma
- Functional Causes:
- Muscle Tension Dysphonia (MTD)
- Puberphonia
- Psychogenic Dysphonia/Aphonia
- Neurological Causes:
- Vocal Cord Palsy (RLN/SLN)
- Spasmodic Dysphonia
- Parkinson's, Myasthenia
- Systemic Causes:
- Hypothyroidism
- LPRD

| Feature | Vocal Nodules | Vocal Polyps | Vocal Cysts |
|---|---|---|---|
| Location | Bilateral, Ant 1/3-Post 2/3 jnct. | Unilateral (usu.), mid-membranous fold | Unilateral, in SLP |
| Etiology | Chronic voice abuse | Acute voice abuse/trauma | Mucous gland block/congenital |
| Appearance | Small, white, callous | Lg, red/pale, gelatinous/hemorrhagic | Submucosal, yellow/white, rnd |
| Voice Quality | Breathy, hoarse, effortful | Hoarse, diplophonia, breathy | Hoarse, diplophonia (size-dep.) |
Clinical Approach - Unmasking Dysphonia
History Taking:
- Onset (sudden/gradual), duration (acute <3 weeks, chronic >3 weeks), progression.
- Severity: GRBAS (Grade, Roughness, Breathiness, Asthenia, Strain) 📌.
- Associated: Odynophonia, dysphagia, stridor, cough, globus.
- Vocal habits, occupation, smoking/alcohol. Hoarseness >3 weeks warrants laryngoscopy.
Red Flags for Malignancy:
| Symptom/Sign | Note |
|---|---|
| Persistent Hoarseness | Esp. smokers, >3 wks |
| Unexplained Weight Loss | Systemic sign |
| Hemoptysis | Bleeding |
| Neck Mass | Metastasis |
| Referred Otalgia | Nerve involvement |
- Voice: Quality, pitch, loudness.
- Laryngeal Exam:
- IDL.
- FNPLS (gold standard).
- Videostroboscopy (mucosal wave).
- Neck Palpation.

⭐ Videostroboscopy is crucial for differentiating benign vocal fold lesions like cysts from nodules or polyps by assessing the mucosal wave, which is typically reduced or absent over a cyst.
Common Culprits - Vocal Villains
- Acute Laryngitis: Viral. Hoarseness. Mgt: Voice rest, hydration.
- Vocal Nodules: Voice abuse. Bilateral, 'singer's nodes'. Mgt: Voice therapy; surgery if refractory.
- Vocal Polyps: Voice abuse/trauma. Unilateral. Mgt: Voice therapy, microlaryngeal surgery.
- Reinke's Edema: Smoking, 'smoker's voice'. Bilateral diffuse swelling. Mgt: Smoking cessation, voice therapy, surgery.
- Vocal Cord Paralysis: Iatrogenic (thyroidectomy), malignancy, idiopathic.
- Unilateral: Breathy voice, aspiration risk.
- Bilateral: Stridor, airway emergency.
- Invx: CT. Mgt: Voice therapy, injection, thyroplasty.
- Laryngeal Carcinoma: Risks: Smoking, alcohol. Persistent hoarseness. Early glottic: good prognosis.
| Feature | Acute Laryngitis | Vocal Nodules | Vocal Polyps | Reinke's Edema |
|---|---|---|---|---|
| Etiology | Viral | Voice abuse | Voice abuse/trauma | Smoking |
| Laterality | Bilateral | Bilateral | Unilateral | Bilateral |
| Key Feature | Inflammation | 'Singer's nodes' | Sessile/pedunc. | 'Smoker's voice' |
| Mgt (Prim.) | Voice rest | Voice therapy | Voice Rx/Surgery | Stop smoking |
⭐ The most common cause of iatrogenic unilateral vocal cord paralysis is thyroid surgery due to recurrent laryngeal nerve injury.
High‑Yield Points - ⚡ Biggest Takeaways
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