Inflammation of the eustachian tube is a condition in which the mucous membrane of the eustachian tube becomes congested and edematous due to infection, which in turn causes the tube lumen to become blocked, resulting in the absorption of gas in the middle ear cavity and the formation of negative pressure, which can lead to symptoms such as tinnitus, a feeling of stuffiness in the ear, hearing loss, and pain in the eustachian tube. The nasopharyngeal cavity and the tympanic cavity are connected by the eustachian tube, which opens when swallowing or yawning, and air enters the tympanic cavity from the nasal cavity so that the pressure is equal to that of the outside world in order for sound to be transmitted smoothly into the inner ear. If the eustachian tube becomes inflamed, the mucous membrane of the nasal cavity and the pharyngeal drum will swell, and the tympanic chamber will form a dense cavity with negative pressure and inward trapping of the tympanic membrane, resulting in a stuffy feeling in the ear, tinnitus, and in severe cases, fluid in the middle ear, resulting in hearing loss. Patients may experience pain in the otorhinopharynx when yawning or chewing. In addition, due to viral infection, the ducts become congested and swollen, and when the inflammation infects the vocal cords, patients may experience hoarseness of the voice. Patients with eustachian tube inflammation should seek medical attention in a timely manner. Antibiotics and hormonal drugs can be applied, and the eustachian tube can also be blown open by pinching and puffing or catheterization. If the above treatments are not effective, tympanocentesis may be performed.