The reason for children’s summer nosebleeds is mainly caused by damage to the nasal mucosa, and the causes of damage to the nasal mucosa can be physiological factors and allergic rhinitis and other pathological factors. 1. Physiological factors: children’s nasal mucosa is weak, in the hot summer nasal cavity is too dry, the chance of nasal mucosa damage increases, coupled with high temperatures and other reasons for the expansion of capillaries, so that it is easy to rupture, so in the strenuous activities or a little touching of the nasal mucosa, nosebleeds can occur. 2. Pathological factors: children with allergic rhinitis, deviated septum and other diseases are also prone to nosebleed. For example, in allergic rhinitis, nosebleeds can occur after contact with allergic factors; in deviated septum, the septum presses on the nasal turbinates, causing nosebleeds. There may be other reasons for children to have nosebleeds in the summer, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.