Adenoid hypertrophy in children is more common in clinical practice and has attracted more and more attention from parents and doctors. The adenoids are a mass of lymphatic tissue located in the posterior wall of the nasopharynx (near the posterior nostril) and are generally largest at the age of 6 or 7 years and gradually degenerate and shrink at the age of 10 or so. As children have low immunity and are prone to upper respiratory tract infections, adenoids often become enlarged and hypertrophied after one or several colds, and the adenoids do not shrink after the colds get better. The dangers of adenoid hypertrophy 1, children with adenoid hypertrophy or accompanied by tonsillar hypertrophy can cause obstructive sleep apnea hypoventilation syndrome. The symptoms of this disease are sleep snoring with breath-holding (i.e., apnea) and open-mouth breathing. The prevalence of obstructive sleep apnea syndrome in children is about 2%, mainly occurring at the age of 2 to 6. Apnea and hypoxia can affect the growth and development of children to varying degrees, such as causing abnormalities in respiration, development and neurocognition, and in severe cases, even causing sudden death in children. 2, long-term breathing through the mouth, under the impact of airflow, the hard palate high arch, will make the facial development deformation, appear short and thick upper lip cocking, lower jaw sagging, nasolabial groove disappeared, upper incisors protruding, poor bite, etc.. Due to the restricted movement of facial muscles, the child’s face lacks expression, which is called “adenoid face” in medical science. 3, hypertrophy of the adenoids and tonsils will make the upper airway breathing obstruction, children are prone to recurrent upper respiratory tract infections, rhinitis, sinusitis recurrent attacks, the result of tonsils, adenoids further enlargement, forming a vicious circle, not easy to relieve. 4. Adenoid hypertrophy in children can cause inflammation of the nasal cavity and sinuses that cannot be easily drained, compression or obstruction of the eustachian tube (the channel between the middle ear cavity and the nasal cavity), inflammation of the adenoids themselves, and poor elasticity of the cartilage of the eustachian tube in children, and other such reasons can cause exudative otitis media. According to our clinical statistics, the incidence of exudative otitis media among children hospitalized with obstructive sleep apnea hypoventilation syndrome is 74.3%. Therefore, children with obstructive sleep apnea hypoventilation syndrome should be more alert to oozing otitis media. Adenoid hypertrophy in children can be treated very well with endoscopic, minimally invasive surgery for removal.