Acute suppurative otitis media is a purulent inflammation of the mucous membrane of the middle ear, most often seen in winter and spring, and is more likely to develop when systemic resistance is reduced. It is more likely to occur in children. Acute suppurative otitis media is caused by the invasion of purulent pathogenic bacteria into the tympanic chamber, often accompanied by inflammation of the mucous membrane of the eustachian tube and mastoid airspace. The common causative agents are Streptococcus haemolyticus, Staphylococcus aureus, type III pneumococcus and Aspergillus. They can invade the middle ear via the eustachian tube route after acute upper respiratory infections, acute infectious diseases and swimming or diving in sewage, improper pharyngeal drum blowing, nose blowing or nasal treatment. Or the middle ear is invaded via the eustachian tube route after tympanic membrane trauma, tympanic membrane puncture, or tympanic tube placement. In infants and young children, the eustachian tube is short, wide, and straight. If they are not properly positioned for breastfeeding or lying down for sucking, milk or vomit may flow into the middle ear through the eustachian tube, thus causing middle ear infection more easily than in adults.