👂 Otitis Externa vs Otitis Media Differential Simulator

Patient Presents With Ear Pain

Otalgia has two common causes needing quick differentiation.

• Summer: Otitis externa peak season (swimming exposure)
• 6–24mo: Otitis media peak age (young children)
• Itch+pain: Externa key symptom (canal-based)
• Deep pain: Media key symptom (often with fever)

Why history matters first

Recent water exposure suggests externa; recent cold suggests media.

Ask about swimming and recent URI before exam.

Pain character differs

Externa pain worsens with chewing or ear movement.

Age distribution differs

Media is far more common in young children.

Tragus and Pinna Traction Test

A simple bedside maneuver separates the two conditions fast.

• Positive: Externa traction pain (canal inflamed)
• Negative: Media traction pain (canal spared)
• Moderate: Test sensitivity (not perfect alone)
• $0: Test cost (no equipment needed)

How the test works

Gently pull the pinna and press the tragus inward.

Interpreting pain response

Sharp pain implicates the external canal, not the middle ear.

Painful traction strongly favors otitis externa.

Limits of the test

Severe media can still cause mild referred discomfort.

Otoscopy — Canal and Eardrum View

Direct visualization confirms which structure is inflamed.

• Swollen: Externa canal (often with debris)
• Obscured: Externa eardrum (hard to visualize)
• Bulging red: Media eardrum (loss of light reflex)
• Normal: Media canal (unaffected by disease)

Externa canal findings

Edema, erythema, and moist debris narrow the canal.

Media eardrum findings

Bulging, opacified, erythematous tympanic membrane with effusion.

Bulging red eardrum is the hallmark of media.

Pneumatic otoscopy clue

Reduced eardrum mobility supports middle ear effusion.

Risk Factor Review

Exposure history points toward the likely diagnosis.

• Swimming: Externa risk (moisture trapped in canal)
• Q-tip use: Externa risk (skin barrier trauma)
• Recent URI: Media risk (eustachian dysfunction)
• Daycare: Media risk (viral exposure)

Externa risk drivers

Trapped moisture and skin trauma favor bacterial overgrowth.

Media risk drivers

Viral URI causes eustachian tube swelling and fluid trapping.

Recent cold plus fever suggests otitis media.

Overlap cases

Some patients have combined risk factors present.

Treatment Route Selection

Route of therapy follows directly from the anatomic site.

• Topical drops: Externa first-line (antibiotic + steroid)
• Oral antibiotic: Media first-line (if indicated)
• Rare: Externa systemic use (only if spreading)
• Sometimes: Media watchful wait (mild cases, older kids)

Topical therapy for externa

Drops deliver high local concentration directly to canal.

Systemic therapy for media

Oral antibiotics reach the middle ear through the bloodstream.

Topical treats externa; systemic treats media when indicated.

Follow-up guidance

Recheck if pain or fever persists beyond expected course.

Quick differential summary