Causes of otitis media
Ear infections are caused by bacteria and viruses. Many times, an ear infection begins after a cold or other respiratory infection. The bacteria or virus travel into the middle ear through the eustachian tube (there’s one in each ear). This tube connects the middle ear to the back of the throat. The bacteria or virus can also cause the eustachian tube to swell. This swelling can cause the tube to become blocked, which keeps normally produced fluids to build up in the middle ear instead of being able to be drained away. Adding to the problem is that the eustachian tube is shorter and has less of a slope in children than in adults. This physical difference makes these tubes easier to become clogged and more difficult to drain. The trapped fluid can become infected by a virus or bacteria, causing pain.
