The most common cause of fluid buildup in the ear is recurrent chronic otitis media, with clinical symptoms such as conductive deafness, which may be accompanied by tinnitus, tinnitus, and other symptoms. If the fluid does not disappear over a long period of time, it may also cause abnormalities in the pharyngeal opening of the eustachian tube, the only outlet of the middle ear cavity, resulting in the inward trapping of the eardrum, which may be accompanied by clinical symptoms such as tinnitus and stuffy ears. If the fluid accumulation is repeatedly irritated and causes conductive deafness for too long, it can lead to a chronic inflammatory reaction in the middle ear cavity. When patients smoke, drink alcohol, eat spicy food, or become emotionally agitated, this can lead to an inflammatory response in the middle ear.