Commonest cause of otorrhea.. Otitis externa. Eustachian tube dysfunction

Commonest cause of otorrhea:
- Otitis externa***
- CSF otorrhea
- Liquefied eczema
- Eustachian tube dysfunction
Overall, the most common causes are:
• Acute otitis media with perforation
• Chronic otitis media (with a perforation of the eardrum, cholesteatoma, or both)
• Otitis externa.
The most serious causes are necrotizing external otitis and cancer of the ear.