Ear infections are common in children because the eustachian tube is still in development. It runs horizontally for a short stretch, rather than vertically like an adult's eustachian tube. This means fluid tends to pool in it and makes a prime breeding ground for bacteria.
Ear infections are caused by water, moisture, and bacteria growth also known as germs that get inside the inner ear. This buildup in the inner ear irritates the Eustachian tube, which is between the middle ear and throat. The irritation causes the tube to swell.
The swelling puts added pressure and causes the ear to ache. I wrote an article on this very subject which you can read here: hubpages.com/hub/What-Every-Parent-Needs-to.
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