If you have a cough with blood in the sputum, you should pay more attention to it, as it may be a disease of your lungs or airways. 1. Lung disease. The lungs are the most important organ for each of us, and problems here can affect our health or life. If there is blood in the sputum, it is likely that there are diseases in the lungs, such as pneumonia, lung abscess, tuberculosis, lung tumors, etc. 2. Bronchial diseases. Many diseases of bronchitis may show symptoms of coughing and blood in sputum, such as bronchial tuberculosis, bronchial calculus, bronchitis, etc. These diseases lead to congestion, edema, and even bleeding of the bronchial mucosa, and the above symptoms appear. Blood in the sputum is something that should not be ignored and should not be taken too lightly, but when suffering from this disease, we should not be too anxious, because nowadays, medicine is able to cure most of the diseases that cause the above symptoms. You need to go to the hospital for examination and treatment in time to avoid delaying the condition.