The hazards of children picking their noses include causing nasal bleeding, nasal infection, and destroying the nasal barrier. 1. lead to nasal bleeding: children’s nasal mucosa is more fragile, picking the nose is easy to damage the nasal mucosa, the phenomenon of local small blood vessel rupture, which leads to nasal bleeding, the formation of blood crusts, may have a certain impact on the respiratory total. 2. lead to nasal infection: nasal mucosa damage, the resistance to pathogens has decreased, it is easy to appear bacterial infection phenomenon, which leads to rhinitis, sinusitis and other diseases, nasal congestion, runny nose and other symptoms. 3. Destruction of the nasal barrier: children digging their noses if the nasal mucosa or nasal hairs are damaged, will destroy the nasal barrier, resulting in a decrease in the ability of the nasal cavity to filter dust and germs, thus increasing the risk of respiratory tract infection. Children usually need to avoid the phenomenon of picking their noses, picking their noses after the emergence of sinusitis, nosebleeds and other phenomena, should be promptly examined, and actively for treatment.