Causes of ear inflammation.. Swelling causes swelling of the tube between the ear and throat. The fluid collects in the ear and the germs grow, causing inflammation

There is a small tube between the ear and throat, the flu causes swelling in the tube, and when swelling to the point of obstruction, the fluid collects in the ear, which provides a very suitable environment for the growth of bacteria causing inflammation.
Ear infections usually occur in young children because their tubes are smaller and can be blocked more easily.