Adenoid hypertrophy is very common in clinical practice and has attracted increasing attention from parents. Generally speaking, adenoids are largest at the age of 6 to 8 years and gradually degenerate and shrink around the age of 14 years, and most of them have disappeared by adults. In childhood, especially after the age of 3, due to low immunity and susceptibility to upper respiratory tract infections, repeated colds often promote adenoid hypertrophy, after which the cold gets better but the adenoids do not shrink. Because of the location of the adenoids, their enlargement can lead to a series of nasal, pharyngeal and ear symptoms. Adenoid hypertrophy or concomitant tonsillar hypertrophy in children can cause obstructive sleep apnea hypoventilation syndrome. The symptoms of this disorder are sleep snoring with breath-holding (i.e., apnea) and open-mouth breathing. It mainly occurs between the ages of 3-6 years, and apnea and hypoxia can affect children’s growth and development and other abnormalities to varying degrees. Long-term breathing through the mouth, under the impact of airflow, the hard palate is high arched, which will deform the facial development, resulting in short and thick upper lip cocking, lower jaw sagging, nostril facing skyward, nasolabial groove disappearing, upper incisors protruding, and poor bite. Due to the restricted movement of facial muscles, the child’s face lacks expression, which is called “adenoid face” in medical science.