Adenoid hypertrophy does not necessarily mean that a child’s upper lip is upturned. Adenoid hypertrophy occurs in children aged 3-5 years old, and children with adenoid hypertrophy usually have accompanying symptoms. Secondly, if it appears suddenly, we should consider whether the child has a bump, which may be a local injury, resulting in swelling and an upturned upper lip. If the symptoms are mild, they may also be related to factors such as oversized bottle nipples and frequent open-mouth breathing. Adenoids belong to the respiratory system, and when pathological hypertrophy occurs, it usually first leads to narrowing of the nasopharyngeal cavity, poor nasal airflow, and symptoms of upper respiratory tract obstruction, such as nasal congestion and runny nose, often accompanied by rhinitis and sinusitis attacks. Symptoms such as tinnitus, hearing loss, and coughing may also occur. Adenoid facies, such as elongated upper jaw, uneven teeth, poor bite, upturned upper lip, and indifferent expression, are usually seen only in severe cases. Therefore, there is no need to worry too much when only the upper lip is upturned, it may not be adenoid hypertrophy and can be seen in a regular hospital to clarify the cause and actively give treatment. Clinicians can usually make a clear diagnosis through physical examination, nasopharyngeal examination combined with imaging examinations.