Tinnitus caused by nasopharyngeal carcinoma is mostly simple tinnitus on one side of the ear, and it is also accompanied by hearing loss, which is one of the early clinical manifestations of nasopharyngeal carcinoma. The main reason for this phenomenon is that the nasopharyngeal tumor blocks the eustachian tube connecting the middle ear and nasopharynx, an opening in the nasopharynx, and the eustachian tube is the only channel for ventilation and drainage of the middle ear, which will prevent the nasopharyngeal gas from entering the tympanic chamber, thus causing the pressure inside the tympanic membrane to form a pressure lower than the outer side, and the serum inside the capillaries in the middle ear cavity will penetrate into the middle ear cavity due to the negative pressure, forming middle ear tendon, i.e. secretory otitis media. Tinnitus caused by nasopharyngeal carcinoma is usually accompanied by hearing loss, and the hearing test often shows conductive hearing loss, which is easily misdiagnosed as otitis media. These symptoms of tinnitus and hearing loss will improve temporarily after middle ear fluid is aspirated, but they will reappear in a short time.