Children occasionally nosebleed, may be due to physiological factors, such as environmental changes, bad habits and other causes of nosebleeds, but also because of pathological factors, such as trauma, disease and other causes. First, physiological factors 1, environmental stimuli: indoor temperature is too high or too low, dry air, poor environmental quality and other factors can lead to occasional nosebleeds in small children, because the external environment leads to excessive dryness of the nasal cavity, affecting the nasal mucosa and capillary permeability, which can be the phenomenon of nosebleeds; 2, bad habits: some children due to the age of the young, poor personal hygiene habits, like to pick their noses with their fingers, but Due to the long nails, the nasal mucosa may be damaged in the process of picking boogers, which may lead to nosebleeds; 3, physiological structure abnormalities: for example, deviated nasal septum, due to the uneven development of the bones that make up the nasal septum, occasional nosebleeds can occur, and also accompanied by headaches, nasal congestion and other symptoms. Second, pathological factors 1, trauma: children are naturally playful and active, it is inevitable to bump in the movement, foreign objects lead to nose trauma, may cause nosebleeds; 2, diseases: such as hepatitis, blood diseases, scarlet fever, measles, rhinitis and other diseases can lead to nosebleeds. In addition, when the child is sick and has a fever, the capillaries of the nasal mucosa are in a state of expansion, and if accompanied by a violent cough, the capillaries may rupture and bleed.