Nasal blood can be seen in rhinitis, nasal septum deviation, nasal tumor and blood diseases, etc., it is recommended to go to the hospital in time to find out the cause of the symptomatic treatment. 1. Rhinitis: it can lead to rupture of capillaries in nasal mucosa and bleeding, in addition, it can be accompanied by nasal congestion, nasal itching and sneezing, etc. It can be diagnosed by nasal endoscopy and serological examination of allergic reactions in the hospital. 2. Deviated nasal septum: Bruising often occurs in the convex surface of the deviated septum, bone ridge and other parts of the septum, which can be stimulated by airflow and other mucosal erosion and bleeding, and it can be diagnosed by nasal endoscopy, sinus CT and other diagnostic procedures. 3. Nasal tumors: such as fibrous hemangioma in the nasal cavity, bleeding may occur due to rupture of blood vessels, which requires timely examination by nasal endoscopy. 4. Blood diseases: such as leukemia and other coagulation disorders caused by the nasal cavity with symptoms of bruising, can be routine blood, coagulation and other tests. It is recommended that the patient actively seek medical treatment, systematic examination and clear diagnosis.