Spring nosebleed may be some physiological phenomenon, may also be the manifestation of certain diseases, such as seasonal allergic rhinitis, dry rhinitis, etc., should be timely consultation to identify the cause of the disease. 1. Physiological factors: due to the initial alternation of cold and heat in spring, the temperature difference between day and night is large, the body has not adapted in time, and it is easy to occur nasal mucosa dryness, which can increase the risk of rupture of nasal blood vessels and bleeding. 2. Pathologic factors: (1) Seasonal allergic rhinitis: due to more pollen in spring, it is easy to induce allergic reaction of nasal mucosa, resulting in recurrent attacks of allergic rhinitis. As most of the patients have symptoms such as nasal itching, paroxysmal continuous sneezing, large amount of watery nasal mucus and nasal congestion, the nasal mucosa is eroded and the capillaries are ruptured causing nosebleeds. (2) Dry rhinitis: Due to the aggravation of dry rhinitis by the spring climate, there may be dryness and discomfort in the nasal cavity, a decrease in nasal secretions, or viscous secretions that are not easy to blow out; there may be tingling or itching, a foreign body sensation; and it may easily cause rupture of capillaries, leading to rhinorrhea or nasal discharge with blood. As this symptom alone cannot determine the disease, it does not rule out other factors. It is recommended that if physiological causes are ruled out, the patient should consult a doctor in time to clarify the cause of the disease and give targeted treatment.