Adenoid hypertrophy is mostly due to repeated episodes of adenoid inflammation, neighboring parts of the inflammation wave and so on. 1. Recurrent adenoid inflammation: adenoids are also known as pharyngeal tonsils, adenoid inflammation is mostly caused by viral or bacterial infections, and can be secondary to upper respiratory tract infections. Repeated episodes of adenoid inflammation can stimulate pathological adenoid hyperplasia. 2. Inflammation in neighboring areas: Inflammation of the nasal cavity, sinuses and tonsils can also affect the adenoids located in the nasopharynx and stimulate their hyperplasia. Swelling and hypertrophy of adenoids will also block the posterior nostrils, leading to poor drainage of nasal secretions, rhinitis, sinusitis and other inflammatory secretions will further stimulate adenoid hyperplasia, leading to a vicious circle. 3. Other: allergic rhinitis, allergic asthma and other allergic reactions may also stimulate adenoid hypertrophy. Some children eat before going to bed, and children’s pharyngeal contractile muscle function is not complete, easy to produce reflux pharyngitis, reflux of gastric contents may also stimulate adenoid hyperplasia. It is recommended that children with upper respiratory tract infections, rhinitis and other timely consultation, but also pay attention to prevention, if conservative treatment is ineffective need to be early surgery to remove the adenoids.