Coughing up bloody sputum is not always a manifestation of lung cancer, but can also occur in other diseases, such as bronchiectasis, lung abscess, tuberculosis, pneumonia, etc. In case of bronchiectasis, the dilated bronchial tubes will cause the rupture of small blood vessels, which will lead to coughing up blood or hemoptysis, and when mixed with sputum, it will appear as bloody sputum. In addition, tuberculosis can also cause the rupture of small blood vessels, especially cavitary tuberculosis, which can cause the rupture of small blood vessels and also easily show the symptoms of coughing up bloody sputum. In addition, tumor tissues with rich blood supply can cause bleeding if they invade blood vessels or if the blood vessels rupture during severe coughing, which is characterized by intermittent or persistent, repeated small amounts of blood in sputum or small amounts of hemoptysis. Patients coughing up blood sputum should have a lung chest X-ray taken and, if necessary, sputum culture done to determine what kind of disease it is, and then targeted treatment. Patients coughing up bloody sputum should pay attention to keeping warm, exercise and diet reasonably, and protect the heart and lung function in their life.