Whether coughing nose bleeding is serious or not needs to be judged according to the cause of bleeding. If the bleeding is small, observation or pressure can be applied to stop the bleeding. If the bleeding is large, consideration should be given to whether it is caused by an acute inflammatory infection of the respiratory tract, tuberculosis, or other primary disease. If so, prompt medical treatment should be sought, usually without serious consequences. If caused by bronchiectasis or lung cancer, the situation is relatively more serious. 1. Acute inflammatory infection of respiratory tract: due to decreased resistance, viral or bacterial infection causes vasodilatation of nasal mucosa, accelerated blood flow, mucosa and blood vessels in the nasal cavity become eroded and ruptured, and nasal bleeding easily occurs under the stimulation of coughing, which is generally not serious and can be relieved after anti-inflammatory treatment. 2. Tuberculosis: patients suffering from Patients with tuberculosis may also suffer from nasal bleeding if side effects are produced by medication or due to nasal infection by Mycobacterium tuberculosis. It is recommended that the treatment plan can be adjusted under the guidance of a doctor and can generally be cured after standardized treatment; 3. Bronchiectasis: chronic purulent inflammation and fibrosis of the bronchi and surrounding lung tissues, and destruction of the muscles and elastic tissues of the bronchial walls, resulting in bronchial deformation and lasting expansion, and As a result of septic inflammation, the patient develops symptoms of coughing up blood. If the amount of coughing blood is large, some of it may overflow from the nasal cavity. If the bleeding cannot be stopped, surgical treatment is required. If this disease is not actively treated, it is usually more serious; 4. Lung cancer: when lung malignant tumor reaches the advanced stage, there will be a decrease in coagulation function or cancer cells metastasizing in the blood, so lung cancer may have the symptom of nosebleed, which is more difficult to be cured and the condition is more serious, so it is recommended to seek medical treatment in time.