Bleeding from the nose can be seen in local factors such as rhinitis, deviated septum, nasal trauma, tumors, etc. It can also be seen in diseases such as leukemia, decreased platelet counts, and abnormal clotting factors. 1. Local factors: rhinitis or nasal trauma, nasal septum deviation will have the risk of nasal mucous membrane damage rupture triggering bleeding. Tumors in the nasal cavity can lead to local tissue necrosis, blood vessel rupture and trigger bleeding in the nasal cavity and sinuses. 2. Systemic factors: leukemia, abnormal platelet count, abnormal coagulation factors, these blood system diseases can cause nasal bleeding phenomenon, while in other parts of the body may also be accompanied by subcutaneous and submucosal bruising. Frequent bleeding or persistent nosebleeds should be diagnosed after systematic examination by a doctor.