Diseases with blood in sputum are seen in lung diseases, cardiovascular diseases and other diseases. 1. Lung diseases: blood in sputum can be seen in lung diseases such as tuberculosis, bronchopneumonia, bronchiectasis and so on, but also in bronchial tumors, various kinds of pneumonia and so on. 2. Cardiovascular diseases: it can be seen in pulmonary stasis caused by heart failure, and also in mitral stenosis. 3. Other diseases: such as leptospirosis hemorrhagic, hemophilia, leukemia, etc. The above diseases can lead to hemoptysis, but before that, attention should be paid to consider the backflow into the respiratory tract after bleeding from the oral cavity and nasal cavity. Therefore, you should check yourself for recent nasal bleeding and gum bleeding. The appearance of blood in sputum, need to actively consult the doctor, after clarifying the cause of the disease to carry out targeted treatment, drugs need to follow the doctor’s instructions for rational application.