Children snoring loudly may be obesity, improper sleeping posture and other physiological factors, or consider the septum deviation, nasal polyps and other diseases. 1. Physiological factors: if obesity, improper sleeping posture, may affect the nasal ventilation, appear children snoring loudly. If the child does not have other uncomfortable symptoms, it is a normal phenomenon, no need to worry. 2. Deviated septum: Deviated septum may be caused by developmental abnormalities, trauma, huge nasal polyps, heredity and other factors. Children with deviated septum may suffer from nasal congestion, headache, open-mouth breathing and other symptoms, and may snore loudly during sleep. 3. Nasal polyps: the cause of nasal polyps is not yet clear, it may be caused by pathogen infection, heredity, low immunity and other factors. The child may have nasal congestion, and progressive aggravation, manifested as occlusive nasal sound, sleep snoring, some children snore loudly. There are many reasons that cause children to snore loudly, so parents are advised to bring their children to regular hospitals to find out the causes of the disease.