According to the latest otitis media guidelines of the Chinese Medical Association, otitis media is divided into the following types: 1. Secretory otitis media: It occurs in children (because the development of the eustachian tube in children is not complete), and unilateral secretory otitis media should exclude the possibility of nasopharyngeal cancer. 2, purulent otitis media: divided into acute purulent otitis media and chronic purulent otitis media, often accompanied by tympanic membrane perforation and hearing loss. 3.Middle ear cholesteatoma: It is not a real tumor, but it can erode the bone and should be operated as soon as possible. 4. Other special types of otitis media: they are relatively rare but should be excluded when there is a systemic condition (tuberculous otitis media, AIDS otitis media, syphilitic otitis media, fungal otitis media, necrotizing otitis media, radioactive otitis media, pneumatic otitis media).