causes of ear infections with ear tubes
Ear infections occur when one of your Eustachian tubes becomes swollen or blocked and fluid builds up in your middle ear. Eustachian tubes are small tubes that run from each ear directly to the back of the throat. The causes of Eustachian tube blockage include: 1  allergies. 2  colds. 3  sinus infections. 4  excess mucus. 5  tobacco smoking.