Frequent nosebleeds from one side of the nose can be caused by atrophic rhinitis, deviated septum, dry rhinitis, and other diseases such as hemorrhagic necrotizing nasal polyps. 1. atrophic rhinitis: atrophic rhinitis is due to nutritional conditions, living environment and other factors, the patient will appear nasopharyngeal dryness, hemorrhage, nasal congestion, loss of smell and other symptoms, in the side of the nasal mucosa atrophy, blood vessels exposed may appear unilateral nose often nosebleed performance. 2. Deviated nasal septum: Deviated nasal septum is mainly caused by dysplasia of the bones, and the main symptoms of patients are nasal congestion, headache, nosebleed, etc. The sharp or protruding mucous membrane of the nasal spine may cause nosebleed. When the nasal spine is sharp or the mucous membrane of the protruding part is thin, the symptom of frequent nosebleed may appear. 3. dry rhinitis:dry rhinitis due to climate, environment and other factors, the patient will have nosebleed, dryness in the nose, nasal secretion reduction and other symptoms, in the mucous membrane crack damage can occur unilateral nose often nosebleed performance. 4. Other: hemorrhagic necrotizing nasal polyps, nasal cancer and other diseases can also lead to the phenomenon of unilateral nosebleeds. Patients who have symptoms of frequent nosebleeds from the left side of the nose should go to the hospital in a timely manner, and follow the doctor’s instructions to determine the cause of the disease and standardize the diagnosis and treatment.