In order to explain this, we need to break down the concept first: (1) What is the middle ear? The term “ear” as commonly used by the general public is not quite the same as the term “ear” as used by doctors. The ear includes the outer ear, the middle ear and the inner ear, which contain many, many smaller structures. The “ear” that people often refer to is the auricle in the outer ear, but the outer ear also includes the external auditory canal. The middle ear, which includes the tympanic cavity, eustachian tube, sinus and mastoid process, is responsible for transmitting sound from the outer ear to the inner ear. When the middle ear is affected by otitis, the four brothers, namely the tympanic chamber, the eustachian tube, the sinus and the mastoid process, the transmission of sound is often affected and we feel that our hearing is not good. (2) What is inflammation? Inflammation is defined in Western medicine as the defense response of living tissues with a vascular system to damage factors, and contains a wide range of elements that can be understood as the resistance taken by a person to all factors that can cause damage to him or her. For example, if a hand is smashed and swollen, there is post-traumatic inflammation; a blocked nose with a cold and a runny yellow nose is inflammation caused by microorganisms that harm the body. (3) What is pus? Pus: yellowish-white juice flowing from a sore; pus is a yellowish-white discharge from a wound site. Pathologically, pus is actually a mixture of microorganisms and their fragments, sacrificed human defense cells, body fluids, etc. Pus is the result of a real battle between the human body and the invading big devil (microorganisms). If the person wins, the pus is slowly discharged and the organism gradually heals, but if the big devil wins, it will continue to be uncomfortable, swollen, painful and feverish. (4) What is chronic? Acute suppurative otitis media can heal within a short period of time after regular treatment, up to 6-8 weeks. Beyond this time, it will cause irreversible damage to the mucous membrane and bone of the middle ear, and thus those that exceed 8 weeks in time and cause organic damage to the middle ear are chronic suppurative otitis media. There are many causes of chronic suppurative otitis media, one of which is acute suppurative otitis media that does not heal. It is easy to understand that chronic suppurative otitis media is a slow-onset purulent inflammation of the middle ear mucosa, periosteum, or deep into the bone.