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Otitis externa is commonly caused by trapped moisture in the ear canal or by minor injury to the ear canal. Less commonly, otitis externa can occur after otitis media with a ruptured ear drum.
Risk factors for otitis externa include:
Otitis media is caused by either a viral or bacterial infection of the middle ear. It often follows a cold or upper respiratory tract infection that causes inflammation of the Eustachian tube and prevents normal ventilation and fluid drainage from the middle ear.
Other factors that may predispose otitis media include:
Myringitis, an inflammation of the ear drum may be due to localized infection or trauma.
Risk factors for myringitis include:
Medically Reviewed by a Doctor on 3/23/2015
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