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EN4.1 | Otalgia — SDL Guide

Learning Objectives

• Elicit and document a structured history from a patient presenting with otalgia, distinguishing primary from referred pain
• Describe the clinical features and sensory nerve pathways that explain referred otalgia
• Choose appropriate investigations for a patient with otalgia, including those to exclude occult malignancy
• Describe the principles of management of the common causes of otalgia

INSTRUCTIONS

Otalgia — pain in the ear — is one of the most common ENT complaints and is frequently mismanaged because clinicians examine only the ear and miss the true source of pain. In adults, referred otalgia from the throat, teeth, jaw, or larynx is at least as common as primary ear disease, and unexplained otalgia in a middle-aged or elderly adult must raise the alarm for occult head-and-neck malignancy. This module builds the diagnostic framework you need to work through any otalgia case systematically from history to management.

References

• Dhingra PL, Dhingra S — Diseases of Ear, Nose and Throat, 8th ed., Ch. 5: Symptoms of Ear Disease (textbook)
• Hazarika P — Textbook of Ear, Nose and Throat and Head-Neck Surgery, 3rd ed., Ch. 4: Clinical Evaluation of Ear Diseases (textbook)
• Scott-Brown's Otorhinolaryngology Head and Neck Surgery, 8th ed., Vol 3, Ch. 236: Otalgia (textbook)

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Version 2.0 | NMC CBUC 2024

Clinical Presentation of Otalgia

A well-structured history is the most important single step in evaluating otalgia. The history must determine whether the pain arises from the ear itself (primary/otogenic otalgia) or is transmitted from a distant site (referred/non-otogenic otalgia). This distinction guides every subsequent examination and investigation step.

In taking the history, the clinician should characterise the pain using standard parameters — onset, duration, character (dull, sharp, throbbing, burning), severity, radiation, aggravating and relieving factors, and associated symptoms. The associated symptoms listed below are especially revealing because each one tends to localise the source of pain to a specific anatomical region. When you see discharge, you think external or middle ear; when you see dysphagia in an adult smoker, you think pharynx or larynx; when you see jaw clicking, you think temporomandibular joint. Reading the associated symptoms through this anatomical lens at the bedside is the clinical skill that separates a thorough ENT history from a generic "where does it hurt" consultation.

• Discharge (otorrhoea): presence of discharge strongly suggests a primary ear cause (otitis externa, acute or chronic otitis media, cholesteatoma). The character of discharge is itself diagnostic — watery discharge in malignant otitis externa or CSF otorrhoea; purulent discharge in AOM or CSOM; foul-smelling discharge with bone erosion points to cholesteatoma.
• Hearing loss: primary ear pathology (middle or inner ear disease) frequently coexists with pain; referred otalgia does NOT produce hearing loss.
• Tinnitus and vertigo: inner ear involvement. Tinnitus and low-frequency fluctuating hearing loss with vertigo suggest Meniere's disease; acute vertigo after ear pain suggests labyrinthitis secondary to otitis media.
• Trismus, dysphagia, odynophagia, dysphonia: these symptoms point away from the ear toward the oral cavity, pharynx, or larynx — strongly suggesting referred otalgia. Trismus suggests a temporomandibular joint (TMJ) or peritonsillar/pterygomandibular pathology. Dysphagia + otalgia in an older adult with smoking/alcohol history must be treated as oropharyngeal or hypopharyngeal malignancy until proven otherwise.
• Clicking or pre-auricular pain on jaw movement: TMJ dysfunction (Costen's syndrome) — pain reproduced by jaw movement or on palpating the TMJ is diagnostic.
• Dental pain, recent dental work: referred otalgia via the auriculotemporal branch of CN V.
• Neck pain or stiffness: cervical spine pathology referred via the great auricular nerve (C2–C3).

Key red flags in the history that must never be missed:
1. Otalgia in a middle-aged or older adult with no primary ear pathology on otoscopy — this is referred otalgia until proven otherwise.
2. Otalgia + weight loss + dysphagia/dysphonia in a smoker/drinker — must exclude head-and-neck malignancy.
3. Otalgia in a child with persistent fever, severe illness, or high-grade hearing loss — consider complications of AOM (mastoiditis, intracranial extension).
4. Unilateral pulsatile tinnitus + otalgia — consider glomus tumour or vascular anomaly.

The social history should always include tobacco use (smoking, chewing), alcohol consumption, and occupational exposures. Both tobacco and alcohol are major risk factors for squamous cell carcinoma of the upper aerodigestive tract — the most important referred otalgia cause to exclude in adults.

Anatomy and Neuroanatomy Relevant to Otalgia

The rich and overlapping sensory nerve supply of the ear is the anatomical basis for referred otalgia. When a structure remote from the ear is diseased, pain impulses travel centripetally along the nerve that supplies both the diseased structure and the ear — and the brain, which has learned to attribute pain in that nerve's territory to the ear, perceives the sensation as otalgia.

Five nerve pathways are clinically important:

1. Auriculotemporal branch of the trigeminal nerve (CN V₃):
This branch of the mandibular division of CN V supplies the anterior wall of the EAC, the tragus, and the anterior auricle. It also carries sensory fibres from the TMJ, the lower molars, the parotid gland, and the temporal scalp. Dental caries or abscess (especially lower molars), TMJ dysfunction (Costen's syndrome — articular disk displacement or osteoarthritis of the TMJ), and parotid gland pathology all refer pain to the ear via this pathway. TMJ otalgia is classically reproduced or worsened by jaw movement — chewing, opening wide, clenching — and is associated with pre-auricular tenderness.

2. Facial nerve (CN VII) — auricular branch (Ramsay Hunt syndrome pathway):
The auricular branch of the facial nerve supplies the posterior EAC skin and the conchal bowl of the auricle. In herpes zoster oticus (Ramsay Hunt syndrome), the varicella-zoster virus reactivates in the geniculate ganglion of CN VII, causing severe otalgia, vesicular eruption in the EAC and concha, peripheral facial palsy, and sometimes sensorineural hearing loss. This is one of the most painful ear conditions encountered in clinical practice.

3. Jacobson's nerve — tympanic branch of CN IX:
Jacobson's nerve is the tympanic branch of the glossopharyngeal nerve (CN IX). It forms the tympanic plexus on the promontory of the middle ear, supplying the middle ear mucosa. CN IX also supplies the tonsillar fossa, the posterior one-third of the tongue, the oropharyngeal mucosa, and part of the soft palate. Consequently, tonsillitis, peritonsillar abscess, oropharyngeal carcinoma, and lingual tonsil pathology all refer pain to the ear via CN IX. Otalgia after tonsillectomy — a common complaint in the first post-operative week — is referred via this pathway.

4. Arnold's nerve — auricular branch of CN X (vagus):
Arnold's nerve is the auricular branch of the vagus (CN X). It supplies the posterior wall and floor of the EAC and the adjacent posterior auricle. CN X also supplies the laryngopharynx, the hypopharynx, the cervical oesophagus, and the infrahyoid larynx. This is the critical pathway for referred otalgia from laryngeal carcinoma and hypopharyngeal carcinoma — malignancies of the lower pharynx and larynx refer pain to the ear via Arnold's nerve. This nerve also mediates the Arnold's nerve reflex (ear-cough reflex) — stimulation of the posterior EAC (e.g., during syringing or insertion of an earbud) can provoke a cough or even syncope.

5. Great auricular nerve (C2–C3, cervical plexus):
The great auricular nerve, arising from spinal roots C2–C3, supplies the lower auricle, the skin over the mastoid, and the adjacent parotid region. Cervical spondylosis, cervical disc prolapse (especially at C2–3 or C3–4 levels), and posterior triangle lymphadenopathy refer otalgia via this pathway. The pain is typically described as dull and aching, associated with neck pain or stiffness, and worsened by neck movement.

Sensory Nerve Supply of the Ear and Referred Otalgia

ENT Examination and Investigation in Otalgia

The examination protocol for otalgia is broader than for any other ENT complaint precisely because the cause may lie anywhere from the ear to the larynx. A systematic approach in five parts ensures no cause is missed.

Part 1 — Otoscopic examination of both ears:
Begin with a thorough otoscopic examination of both ears. Inspect the auricle, the pre- and post-auricular skin (vesicles in Ramsay Hunt syndrome), the EAC (canal skin — erythema, oedema, discharge, tenderness on tragal pressure in otitis externa), and the tympanic membrane (bulging, opaque, perforated, retracted, cholesteatoma debris in the pars flaccida). A normal otoscopic examination in a patient with significant otalgia immediately shifts suspicion to referred causes.

Part 2 — Oral cavity and oropharynx examination:
With adequate light and a tongue depressor, inspect the oral cavity (teeth, gums, tongue, floor of mouth), the tonsillar fossae (erythema, tonsillar enlargement, peritonsillar bulge, ulceration), the soft palate, the posterior pharyngeal wall, and the base of the tongue. Any ulcer in the oral cavity or oropharynx in an adult with otalgia must be biopsied.

Part 3 — TMJ and parotid gland assessment:
Palpate the TMJ bilaterally while asking the patient to open and close the mouth. Tenderness, clicking, or restricted mouth opening suggests TMJ dysfunction. Palpate the parotid gland for enlargement or tenderness (parotitis, parotid tumour).

Part 4 — Indirect laryngoscopy / fibreoptic nasopharyngolaryngoscopy:
This is the critical step that is most often omitted. Mirror laryngoscopy (or fibreoptic nasopharyngolaryngoscopy) must be performed in every adult with unexplained otalgia to inspect the nasopharynx, hypopharynx, piriform fossae, postcricoid region, and larynx. Hypopharyngeal and laryngeal malignancies characteristically present as painless masses (the malignancy itself is relatively insensate) but refer pain to the ear — the primary lesion can be missed without direct visualisation.

Part 5 — Neck examination:
Palpate the cervical lymph nodes systematically (levels I–VI). A palpable neck node in an adult with otalgia and no primary ear pathology is a malignancy until proven otherwise. Palpate the posterior triangle for tenderness (cervical lymphadenopathy) and assess range of neck movement (cervical spondylosis).

Investigations — guided by examination findings:
- Pure tone audiometry: if hearing loss is present — establishes whether the hearing loss is conductive, mixed, or sensorineural, pointing to middle ear or inner ear pathology.
- Tympanometry: assesses middle ear pressure and tympanic membrane compliance — useful if AOM or middle ear effusion is suspected.
- CT of the temporal bones: if mastoiditis, skull base osteomyelitis, cholesteatoma, or middle ear mass is suspected.
- CT or MRI of the neck and thorax: if referred otalgia from a pharyngeal, laryngeal, or oesophageal lesion is suspected — defines the extent of disease.
- Contrast-enhanced CT neck: for suspected parapharyngeal or parotid pathology, or lymphadenopathy.
- Panoramic dental X-ray (OPG): if dental abscess or lower molar pathology is suspected.
- Fibreoptic nasopharyngolaryngoscopy: for direct visualisation of hypopharynx and larynx in unexplained adult otalgia.
- ESR, CRP, blood count: if systemic causes (vasculitis, infectious mononucleosis) are in the differential.