Severe adenoid hypertrophy is a description of the proportionate degree of adenoids in the nasopharynx, and the size of adenoids can be determined by fiberoptic (electronic) nasopharyngoscopy, lateral nasopharyngeal radiographs, nasopharyngeal CT, and magnetic resonance scanning, etc. Severe refers to adenoid hypertrophy of the third and fourth degrees. With fiberoptic nasopharyngoscopy to observe the size of adenoids, generally mild adenoid hypertrophy refers to I degree and II degree. The first degree is when the adenoids obstruct the posterior nostril by ≤25%, and the second degree is when the adenoids obstruct the posterior nostril by 26% to 50%. Severe degrees are defined as III and IV. Degree III is defined as 51% to 75% postnasal obstruction by adenoids, and degree IV is defined as >75% postnasal obstruction by adenoids. Enlarged adenoids can cause a lot of pressure on the Eustachian tube, which can lead to complications such as occlusive rhinorrhea and secretory otitis media. Severe adenoid hypertrophy needs to actively go to the hospital and cooperate with the doctor to take standardized medication and treatment.