Level 1: Causes of snoring in children 1. Nasal congestion Nasal congestion is one of the main causes of snoring in children. There are many small capillaries and mucous membranes inside the nasal cavity. When these parts are irritated or infected, symptoms such as congestion and swelling will occur, causing the nasal cavity to become narrow and affecting the passage of air. 2. Tonsil hypertrophy: Tonsils are an important part of human immunity, but in some cases they can become enlarged due to infection or other reasons, causing obstruction of the respiratory tract. Especially when sleeping at night, tonsils tend to relax and sag, exacerbating respiratory obstruction. 3. Improper sleeping posture. Improper sleeping posture.