The adenoid is a normal tissue located in the nasopharyngeal area of the human body. Enlargement of the adenoid can block the nasopharyngeal passage, leading to various symptoms and causing dizziness. The primary reason is that adenoid enlargement can lead to snoring and mouth breathing, which affects the supply of oxygen, resulting in dizziness. Additionally, adenoid enlargement may lead to secondary sinusitis, which can also cause symptoms of dizziness and even headaches. Therefore, overall, the enlargement of the adenoid or its associated symptoms can lead to dizziness.