The main cause of sluggish expression is adenoid hypertrophy. The condition is common in children and is usually associated with sleep snoring, nasal congestion, runny nose, breathing difficulties, otitis media and hearing loss. The site of the disease is often overlooked, thus resulting in untimely treatment. A variety of bacteria are present in the adenoids of normal children, but they do not usually develop. When the temperature changes, the child’s malnutrition, the body’s resistance decreases, the upper respiratory tract infection caused by cold stimulation, acute infectious diseases, acute adenoiditis, all can make the adenoids hypertrophy, resulting in sluggish expression. Children with adenoid hypertrophy blocking the posterior nostril and the pharyngeal orifice of the eustachian tube can develop symptoms such as otorhinopharyngeal. The symptoms are open-mouth breathing during sleep, snoring at the back of the tongue, restless sleep at night, nasal secretion, occlusive nasal sound and slurred voice when speaking. As a result of long-term open-mouth breathing, the facial bone development is impaired, the maxilla becomes longer, the hard palate is high arched, the teeth are uneven, the upper incisors are exposed, the lips are thick, the face lacks expression, and there is dementia, forming an “adenoid face”. The ataxic movement between swallowing and breathing is dysfunctional, and choking and coughing often occur. The downward flow of secretions stimulates the mucous membrane of the respiratory tract and makes the patient susceptible to bronchitis. When suffering from chronic rhinitis, sinusitis, nasal secretions after six stimulation to make adenoid hypertrophy, and adenoid hypertrophy impede the ventilation and drainage of the nasal cavity and sinuses, rhinitis or sinusitis is not easy to cure, the two are causal, vicious circle; air pollution, allergic reactions can indirectly cause dull expression.