The causes of blood in the nose are many, including: local factors and systemic factors, common diseases are chronic rhinitis – sinusitis, deviated septum, nasal sinus tumor and blood system diseases. 1. Local factors: nasal trauma, such as frequent nose picking can be repeated nosebleeds; chronic rhinitis – sinusitis patients, can be due to nasal mucosa brittle and easy to bleed repeatedly; deviated septum, deviated at the mucous membrane is thinner, there is an airflow through the deviated side of the nose is prone to intranasal hemorrhage. Patients with nasal cavity, sinus and nasopharyngeal tumors may cause intranasal bleeding when the tumor growth damages blood vessels. 2. Systemic factors: some blood system diseases, liver affecting coagulation function, cardiovascular system diseases, etc., may cause bleeding in the nose. When there are repeated nosebleeds, it is recommended to actively seek medical advice, make a clear diagnosis and follow the doctor’s instructions for treatment.