The adenoids are located at the rear end of the nasal cavity, specifically in the nasopharynx. When the adenoids become enlarged, they can affect the ventilation and drainage functions of the nasal cavity. Therefore, enlarged adenoids can cause rhinitis, leading to symptoms such as nasal congestion, runny nose, reduced sense of smell, and snoring during sleep; these impact the nasal ventilation, which are the most common symptoms. The rationale is that when the adenoids are enlarged, the nasal mucus cannot be normally drained through the nasal cavity's drainage function. As a result, children may exhibit symptoms of excessive nasal discharge and nasal congestion, and difficulty breathing through the nose. Additionally, the rhinitis caused by the enlarged adenoids leads to nasal congestion, which then manifests as the child snoring and breathing through the mouth during sleep. Over time, this can lead to a condition known as "adenoid facies."