The eustachian tube usually maintains the pressure balance inside and outside the middle ear, acts as a drainage and sound prevention device, and is also protective against retrograde infections. Inflammation of the eustachian tube is usually due to inflammation of the mucous membrane inside the tube, which leads to absorption of gas in the middle ear and affects the normal physiological function of the middle ear cavity, and can also cause other diseases to occur. Usually, pharyngotonsillitis occurs due to the following reasons: mechanical blockage, such as lymphoid hyperplasia, hypertrophic rhinitis, etc.; air pressure injury; metaplasia; and pneumatic otitis media. Usually, if the organism suffers from pharyngotonsillitis, it leads to symptoms such as dilatation of the veins of the middle ear mucosa, bruising, and increased permeability, resulting in otitis media. Patients with pharyngotonsillitis may experience ear congestion, and in combination with otitis media, they may also experience deafness, tinnitus, and pus in the ear. Treatment of pharyngotonsillitis depends on the severity of the patient’s condition, the quality of the patient’s health and the location of the injury. Treatment with decongestants and antihistamines is often indicated.