Children sleeping nose breathing sound is generally not normal, may be a cold nasal secretion blockage, may also be adenoid hypertrophy, chronic rhinitis and other factors. 1. Colds: children with colds, sleep may be due to excessive nasal secretions and not cleaned up in time, resulting in children’s breathing is not smooth, thus appearing to sleep the phenomenon of loud nose breathing. 2. Adenoid hypertrophy: mainly caused by repeated episodes of acute nasopharyngitis, the main symptoms of nasal congestion, ear stuffiness, obstructive sleep apnea, drowsiness, etc., is not normal. 3. Chronic rhinitis: It is mainly considered to be caused by disorders of one’s own endocrine or immune system. The child will have nasal congestion, runny nose, headache, post-nasal drip and other symptoms, so the child will have a loud breathing while sleeping, is not normal. It is recommended to seek medical treatment when children have symptoms of loud breathing while sleeping.