Possible causes of nosebleeds in summer include local nasal causes such as trauma, inflammation, nasal foreign bodies, tumors, etc. They can also be seen in systemic diseases such as acute infectious diseases and blood diseases. The causes of nosebleed in summer are nasal local factors or systemic factors. 1. Local causes of nasal cavity include: ① trauma, nose picking, nose blowing, sneezing, nasal bone, nasal septum fracture, etc. can damage the local blood vessels; ② inflammation, inflammation of the nasal cavity, sinuses can damage the mucous membrane capillaries; ③ children’s nasal cavity foreign body, can be seen in the side of the nasal cavity bleeding or bloody mucus; ④ tumors, nasal hemangiomas, such as bleeding is more intense, malignant tumors encroach on blood vessels can cause nosebleeds. 2. Systemic factors are: ① acute febrile infectious diseases, including influenza, hemorrhagic fever, etc., can be due to high fever, nasal mucosa congestion, dryness and other causes of nosebleeds; ② cardiovascular disease, hypertension, congestive heart failure can be due to increased arterial pressure leading to nosebleeds; ③ blood diseases, coagulation abnormalities, platelet count reduction or functional abnormalities can lead to recurrent nosebleeds and so on. When frequent or continuous nosebleeds occur, it is recommended to actively consult a doctor for a systematic examination to clarify the cause and condition, and then follow the doctor’s instructions to standardize the use of medication and treatment.