Nosebleeds in spring may be caused by dry environment, allergic rhinitis or deviated septum. 1. Environmental dryness: the environment is dry in spring, and when children do not supplement water in time, the nasal mucosa will be dry, and the mucosal rupture will cause nosebleeds after being slightly stimulated by the outside world. 2. Allergic rhinitis: in spring, children may be exposed to pollen or animal fur and other substances that can cause allergic rhinitis, and when the nasal cavity is repeatedly stimulated by inflammation, nosebleeds and sneezing can also occur. 3. Deviated nasal septum: Tumors in the nasal cavity or genetic factors may cause deviated nasal septum. This disease can also lead to nosebleeds in spring and may be accompanied by symptoms of decreased sense of smell. Nosebleeds in spring can also be caused by trauma or leukemia, and it is recommended that the patient go to the hospital in time to receive treatment.