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The ear is divided into three sections, each susceptible to different types of infections. The outer ear includes the ear canal leading to the eardrum, and infections here (otitis externa) are commonly caused by water exposure or trauma to the canal lining. The middle ear is the air-filled space behind the eardrum containing three tiny bones that transmit sound, and infections here (otitis media) typically develop when bacteria travel from the throat through the Eustachian tube. The inner ear houses the cochlea for hearing and the vestibular system for balance, and infections here (labyrinthitis) are less common but can cause significant vertigo and hearing changes.

Middle ear infections are the most common type in children, with studies showing that approximately 80 percent of children experience at least one episode by age three. The anatomy of a child's Eustachian tube, which is shorter, narrower, and more horizontal than in adults, makes children particularly vulnerable. When a child develops a cold, the resulting nasal congestion impairs Eustachian tube function, allowing fluid to accumulate behind the eardrum where bacteria can multiply. Understanding this mechanism is crucial for prevention, which focuses on reducing cold exposure, managing allergies, and addressing anatomical factors like enlarged adenoids.