Most ear infections form in the middle ear. The eustachian tube carries fluid from the middle ear to the throat. Sometimes during a cold, the eustachian tube becomes swollen and fluid is trapped in the middle ear. Bacteria or viruses can grow in this fluid and form an ear infection.
|Primary Medical Reviewer||Susan C. Kim, MD - Pediatrics|
|Specialist Medical Reviewer||Charles M. Myer, III, MD - Otolaryngology|
|Last Revised||September 10, 2012|