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Ear Infection Health Center

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Ear Infections - Cause

Middle ear infections are caused by bacteria and viruses.

Swelling from an upper respiratory infection or allergy can block the eustachian tubes, which connect the middle ears to the throat. So air can't reach the middle ear. This creates a vacuum and suction, which pulls fluid and germs from the nose and throat into the middle ear. The swollen tube prevents this fluid from draining. The fluid is a perfect breeding ground for bacteria or viruses to grow into an ear infection.

Recommended Related to Ear Infection

Could Your Child Have an Ear Infection?

Even newbie parents can spot diaper rash or a runny nose with no problem, but ear infections may come with only a whisper of symptoms. Yet three-quarters of children will get one by age 3. "An ear infection happens when you get infected fluid or pus behind the eardrum," says Jennifer Shu, MD, FAAP. She is a pediatrician in Atlanta and editor of American Academy of Pediatrics Baby & Child Health. The most common cause? Colds. When secretions get trapped in the middle ear, viruses or bacteria...

Read the Could Your Child Have an Ear Infection? article > >

Inflammation and fluid buildup can occur without infection and cause a feeling of stuffiness in the ears. This is known as otitis media with effusion.

WebMD Medical Reference from Healthwise

Last Updated: November 14, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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