Girls have been nosebleeds may be physiological, but also may be caused by pathological factors such as nasal diseases, systemic diseases and so on. 1. Physiological factors: such as dry environmental air, long-term consumption of greasy and stimulating food, staying up all night and so on may cause girls to nosebleed. Timely adjustment of lifestyle habits can gradually relieve the symptoms. 2. Pathological factors (1) Nasal diseases: such as turbinate hypertrophy, allergic rhinitis, nasal hemangioma, etc. can cause nasal mucous membrane irritation resulting in nosebleed symptoms. It can also be accompanied by nasal congestion, sticky nasal mucus, swelling of nasal mucosa and other symptoms. (2) Systemic diseases: such as coagulation insufficiency, thrombocytopenia and other blood system diseases, typical symptoms can be manifested as frequent nosebleeds, which need to be taken seriously. If the symptom of nosebleed is not relieved or even aggravated for a long time, the girl should go to the hospital in time to find out the cause of the disease, and actively treat the cause of the disease, so as to avoid delaying the condition.