Summer children old nosebleeds may be caused by dry weather, or acute rhinitis, atrophic rhinitis and other diseases. 1. Dry weather: the weather is dry and hot in summer, and children are naturally active and active, the body sweats more, if there is no timely supplementation of water, to a certain extent, it will lead to dry nasal mucosa, which can easily cause capillary rupture of the nasal mucosa, and then appear nosebleeds. 2. Acute rhinitis: this disease is mainly caused by respiratory viral infections such as rhinovirus and adenovirus, and occasionally secondary to bacterial infections, such as Streptococcus pneumoniae and Haemophilus influenzae. It can be triggered by vitamin deficiency, exertion and other factors, leading to symptoms such as dryness inside the nose, nasal congestion and nosebleed in the affected children. 3. Atrophic rhinitis: The occurrence of primary atrophic rhinitis is related to heredity, malnutrition, long-term dust stimulation, etc., while secondary atrophic rhinitis may be related to pathogenic microbial infections and medical injury. Typical symptoms include nasal congestion, decreased sense of smell, headache, nasal dryness, etc. Some children may have nosebleeds. 4. Other: In addition, children with old nosebleeds also need to consider dry rhinitis, nasal foreign body, nasopharyngeal fibroangioma, aplastic anemia, hemophilia and other diseases. If the summer children always nosebleed, need to go to the hospital, improve the relevant examination, clear the specific cause.