Fluid and pressure can build up in the middle ear because of a blocked eustachian tube. Bacteria or fungi can grow in the fluid and cause an ear infection.
A middle ear infection occurs behind the eardrum. It is most often caused by a virus or bacteria. Most kids have at least 1 middle ear infection by the time they are 3 years old. But adults can also get them.
Middle ear infections are most common in children under age 5. Crankiness, a fever, and tugging at or rubbing the ear may all be signs that your child has a middle ear infection, particularly if your child has a cold or viral illness.
