Adenoids are located in the posterior part of the nasal cavity in the nasopharyngeal area of the posterior wall and the top, between the two sides of the pharyngeal fossa, shaped like half a peeled orange, the surface is uneven, there are 5-6 longitudinal grooves, the center of the grooves is the deepest, forming the central fossa. Adenoids is a kind of lymphatic tissue, because this tissue and the oropharyngeal part of the palatine tonsils of the same nature, so the adenoids are also called pharyngeal tonsils, and and the palatine tonsils are part of the pharyngeal lymphatic ring; most of the children in about 7 years of age began to atrophy, around the age of 10 years of age, degeneration is complete. Because the adenoids are lymphatic tissue, when inflammation occurs in the nasal cavity, sinuses or pharynx, it will stimulate the adenoids to hypertrophy and proliferate, blocking the posterior nasal cavity and affecting the child’s breathing. Children will experience symptoms such as open-mouth breathing and snoring at night. If not treated in time, prolonged open-mouth breathing will lead to adenoid face. Parents are advised that if a child develops symptoms of open-mouth breathing and snoring, it is important to consult a doctor in time to find the cause of the disease and give symptomatic treatment to avoid the occurrence of adenoid facies, which affects the normal growth and development of the child’s appearance and psychology.