Mild hyperplasia of adenoids in children from 3 to 6 years old may have no obvious symptoms, while moderate to severe hyperplasia may have symptoms such as nasal symptoms, ear symptoms, pharyngeal symptoms, adenoid facies, and systemic symptoms. 1. Adenoids exist at birth, but there has been no discomfort symptoms, this situation is called physiological hyperplasia, without special treatment. 2. Nasal symptoms: blocking the posterior nostrils, nasal congestion, runny nose, which is more obvious at night, nasal sound when speaking and snoring. 3. Ear symptoms: adenoid hyperplasia and hypertrophy block the pharyngeal opening of the Eustachian tube, secretory otitis media can occur, showing hearing loss, ear blockage, tinnitus and so on. 4. Pharyngeal symptoms: nasal secretions flow back into the pharynx, which can stimulate the emergence of dry cough and throat clearing. 5. Adenoid face: some patients may have long-term open-mouth breathing, facial bone deformity, upper incisor protrusion, tooth growth irregularity, thickening of lips, etc. 6. Systemic symptoms: in severe cases, there may be more waking up at night, slow reaction, agitation and other uncomfortable symptoms. Therefore, the above symptoms need to consult a doctor in time for clear diagnosis and further treatment.