Children often have nosebleeds in summer, which may be caused by dry nasal mucosa, allergic rhinitis, blood diseases and other reasons. 1. Dry nasal mucosa: Due to the hot weather in summer, dry nasal mucosa can easily lead to the expansion of capillaries in the nasal mucosa, so children will often have nosebleeds. 2. Allergic rhinitis: there are more allergic substances in the air in summer, such as pollen, dust mites, etc. If a child inhales allergic substances that cause the nose to itch, and then picks or rubs the nose, it is easy to cause injury to the nasal mucous membrane manifested as nosebleeds. 3. Blood disease: children often summer nosebleeds may also be related to blood disease, mainly platelet count reduction and coagulation function is abnormal. At the same time, it will be accompanied by fever, fatigue, pallor, palpitation, shortness of breath and other symptoms. If a child has frequent nosebleeds in the summer, and if there are other symptoms, it is recommended that the child be taken to the hospital in time to find out the cause of the problem and then treat it under the guidance of the doctor.