The A/N of adenoid hypertrophy is the ratio of the thickness of the adenoids to the width of the nasopharyngeal cavity, and an A/N value of 0.82 indicates significant hypertrophy of the adenoids. Adenoid hypertrophy is usually caused by repeated episodes of inflammation of the adenoids, or inflammation of the neighboring nasal cavity, tonsils, or sinuses spreading to the nasopharynx, stimulating the adenoids to pathologically hyperplasia, and most often occurs in children between the ages of 2 and 6 years old. The size of adenoids and nasopharyngeal obstruction can be assessed based on the A/N ratio measured by imaging: A is the thickness of adenoids and N is the width of the nasopharyngeal cavity, with normal values of A/N ranging from 0.5 to 0.6, with >0.7 for pathologic enlargement, >0.8 for significant enlargement, and 0.82 for pathologic adenoidal hypertrophy. Adenoid hypertrophy needs active treatment of primary diseases, prevention of colds, pay attention to nutrition, etc. Conservative treatment is ineffective, but also as soon as possible for surgical treatment. It is recommended that the patient should consult the doctor in time and follow the doctor’s instructions.