Occasional nosebleeds in children may be caused by nose picking, dry air, allergic rhinitis and other factors. 1. Nose picking: If the child’s nails are not trimmed in time, frequent nose picking may lead to the mucous membrane in the front of the nasal cavity to appear erosion, rupture, or even bleeding, and the amount of bleeding is usually small. 2. Dry air: the capillaries inside the nasal cavity are more, when the air is dry, it is easy for the nasal mucosa to become dehydrated, increasing the brittleness of the capillary wall, which can easily rupture the capillaries, thus bleeding occurs. 3. Allergic rhinitis: small children love to play outdoors, if the nasal cavity is stimulated by pollen, dust mites, animal hair, etc., may produce inflammatory reaction, nasal congestion, nasal itching, sneezing and other symptoms, if the inflammation of long-term stimulation, it may lead to the nasal mucosa erosion, ulceration, which will cause bleeding. If the child has other uncomfortable symptoms in addition to nosebleeds, he or she should consult a doctor in time to avoid delaying his or her condition.