The causes of pulmonary coughing and bleeding in patients are as follows: 1. Various diseases of the respiratory system: Violent coughing causes destruction of capillaries, resulting in coughing, hemoptysis and other symptoms. 2. Pulmonary tuberculosis: It is accompanied by wasting, weakness, afternoon hypothermia and other symptoms. 3. Malignant tumors of the lung: It is mostly seen in patients over 40 years of age who smoke for a long time, are in a second-hand smoke environment, or have a family history of malignant tumors, and is also accompanied by wasting, weakness, afternoon hypothermia and other symptoms. 4, 4.Pulmonary embolism: Patients will also have dyspnea, chest pain and other symptoms. 5.Other diseases: It can be seen in bleeding in the mouth, such as gingivitis, or nasal bleeding backing up into the pharynx and coughing out by coughing, as well as bleeding in the pharynx itself, which can lead to symptoms of coughing up blood in the sputum and hemoptysis.