The common causes of heavy breathing in 7-year-old children include adenoid hypertrophy, rhinitis, respiratory tract infections, etc. Prompt diagnosis and treatment is recommended. 1. Adenoid hypertrophy: often caused by repeated respiratory tract infections, adenoid hypertrophy affects the smoothness of the respiratory tract, resulting in heavy breathing, accompanied by nasal congestion, runny nose, open-mouth breathing, snoring and other symptoms. 2. Allergic rhinitis: nasal discomfort may lead to heavy breathing, often accompanied by nasal congestion, runny nose, sneezing, coughing and other symptoms, the need to avoid allergens, cleaning the nasal cavity. 3. Respiratory tract infection: Inflammation leads to an increase in airway secretions, resulting in heavy breathing sounds, increased frequency, accompanied by fever, cough, sputum and other symptoms. The 7-year-old child’s breathing sound thick, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.