Sputum with dark red blood belongs to a kind of hemoptysis, hemoptysis refers to the respiratory organs below the throat, i.e. trachea, bronchus or lung tissue, hemoptysis of blood. The process of expulsion from the mouth through coughing action, hemoptysis is not only caused by respiratory diseases, but also by circulatory diseases, trauma or other systemic diseases, systemic factors. It also needs to be differentiated from oral, pharyngeal, nasal bleeding and vomiting blood. However, diseases that cause hemoptysis are commonly associated with respiratory system diseases such as tuberculosis, bronchiectasis, bronchitis, lung abscess, lung cancer, pneumonia and other lung diseases. Inflammation leads to increased permeability of the bronchial mucosa or the capillaries of the lesions, or rupture of the walls of the submucosal blood vessels, thus causing bleeding. Meanwhile circulatory system diseases, commonly rheumatic heart disease, mitral stenosis, hypertensive heart disease, pulmonary hypertension and so on. Hemoptysis, you need to do chest CT first, to rule out any respiratory system diseases, and then according to the nature of the specific lesions, to take appropriate targeted treatment.