Nosebleeds in spring are usually caused by dry environment, nose picking, deviated septum and high blood pressure. 1. Dry environment and nose picking: As spring warms up, the air temperature rises and humidity decreases, the nasal capillaries dilate, leading to dryness, itching and other discomforts of the nose. When digging the nostrils or blowing the nose carelessly, the capillaries will rupture and bleed. 2. Nasal septum deviation: Nasal septum deviation can lead to changes in the nasal passage and changes in breathing airflow, dry weather in the spring, it is easy to cause damage to the nasal mucosa and blood vessel rupture, which leads to nosebleed in the spring. 3. High blood pressure: frequent weather changes in the spring, blood pressure changes, if the pressure is too large will easily lead to the rupture of the blood vessel wall, if it involves the nasal mucous membrane blood vessels, coupled with the nasal mucous membrane is relatively brittle, thin, so it is easy to rupture bleeding. There are many reasons for spring nosebleeds, patients should go to the hospital in time to do the relevant examination, clear cause under the guidance of the doctor to correct treatment.