What is Middle Ear Infection?

Middle ear infection is an infection that occurs behind the eardrum, in the middle part of the ear. While it can happen in people of all ages, it mainly affects children. The medical term for middle ear infection is otitis media. Middle ear infection is the most common childhood illness treated by pediatricians. It usually develops a few days after a child has a cold or the flu. Half of all children will have at least one middle ear infection while they're growing up, most often before age 3.

Ear infections are among the most common illnesses of early childhood. Three out of four children have had at least one ear infection by age 3, according to the National Institute on Deafness and Other Communication Disorders. The medical term for middle ear infections is otitis media. Otitis refers to inflammation of the ear, and media means middle. Although ear infections worry parents and make children uncomfortable, take heart. Most ear infections clear up on their own within a few days, and most children stop having ear infections once they reach school age.

The ear is responsible for hearing and balance and is made up of three parts — the outer ear, middle ear, and inner ear. Hearing begins when sound waves that travel through the air reach the outer ear, or pinna, which is the part of the ear that's visible. The sound waves then travel from the pinna through the ear canal to the middle ear, which includes the eardrum (a thin layer of tissue) and three tiny bones called ossicles. When the eardrum vibrates, the ossicles amplify these vibrations and carry them to the inner ear.
The severity of the symptoms and the age of the patient determines the likelihood of success of antibiotic treatment. Acute otitis media in children below the age of 2 have a poorer prognosis and are associated with an increased number of recurrences of acute otitis media as well as the development of otitis media with effusion in 35% after 6 months. Acute otitis media in older age groups usually resolves on its own without antibiotic treatment.

Bacteria reach the middle ear through the lining or the passageway of the eustachian tube and can then produce infection, which causes swelling of the lining of the middle ear, blocking of the eustachian tube, and migration of white cells from the bloodstream to help fight the infection. In this process the white cells accumulate, often killing bacteria and dying themselves, leading to the formation of pus, a thick yellowish-white fluid in the middle ear. As the fluid increases, the child may have trouble hearing because the eardrum and middle ear bones are unable to move as freely as they should. As the infection worsens, many children also experience severe ear pain.

The main symptom is an earache. It can be mild, or it can hurt a lot. Babies and young children may be fussy. They may pull at their ears and cry. They may have trouble sleeping. They may also have a fever.When fluid builds up but does not get infected, children often say that their ears just feel plugged. They may have trouble hearing, but their hearing usually returns to normal after the fluid is gone. It may take weeks for the fluid to drain away.