Children occasionally picking their noses will not have any serious harm, but long-term habitual nose picking may damage the nasal mucosa, causing nasal infections, affecting the defense function of the nose. 1. Damage to the nasal mucosa: children who regularly pick their noses, because the nasal mucosa is very delicate, easy to cause damage to the nasal mucosa, resulting in mucosal dryness, erosion, thus causing repeated nosebleeds. 2. Nasal infection: children often picking their noses, especially without washing their hands picking their noses, it is easy to bring the external bacteria into the nasal cavity, causing nasal infection, may induce nasal vestibulitis. 3. Affect the defense function of the nasal hairs: there are some nasal hairs in the nasal cavity, children who often pick their noses, easy to lead to nasal hairs off, lose the protection of the nasal mucosa, resulting in the weakening of the defense function of the nasal hairs, which is detrimental to health. It can be seen that children often habitually picking their noses is more harmful, therefore, parents should pay attention to timely correction of the child’s nose picking bad behavior. When abnormalities occur, the child should be taken to the doctor.