Coughing up blood and body weakness, the possible clinical causes are tuberculosis, bronchial dilatation, lung tumors and so on. 1. Tuberculosis: this condition is usually associated with the infection of tuberculosis mycobacterium, and its typical clinical symptoms include night sweats, coughing, coughing up sputum, hemoptysis, and emaciation, etc. Moreover, the consumption of this disease on the body is relatively large, which will also be accompanied by the symptoms of general weakness. 2. Bronchial dilatation: this disease refers to the irreversible expansion of bronchial tubes and fine bronchial tubes caused by repeated airway infections and inflammation, with clinical manifestations such as chronic cough, coughing up a lot of purulent sputum, repeated hemoptysis, etc. People suffering from the disease will have dyspnea and general weakness when the disease is in acute attack. 3. Lung tumor: when malignant tumors appear in the lungs, they may invade the pulmonary blood vessels, leading to hemoptysis, coughing and other symptoms, and the growth and development of tumor cells will produce great consumption on the body of the sick people, leading to general weakness and other conditions. If the general population has related symptoms, it is recommended to go to the hospital for lung examinations, such as X-rays, lung CT, etc., in order to make a clear diagnosis and carry out targeted treatment.