Coughing up sputum with dark red color is considered hemoptysis, which may be caused by pharyngitis, pneumonia, tuberculosis, bronchial dilatation and other diseases. 1. Pharyngolaryngitis: due to the cold caused by pharyngeal discomfort, sore throat, resulting in irritating cough, pharyngeal swelling, pharyngeal congestion, coughing up sputum with occasional blood, and other symptoms. 2. Pneumonia: symptoms such as cough, sputum, fever, etc., chest CT can be seen as flaky high density shadow, causing blood leukocytes, neutrophils percentage increased, C-reactive protein increased and so on. 3. Tuberculosis: coughing, coughing dark red sputum, hot flashes, night sweats, emaciation and other symptoms, need to go to the hospital for tuberculin test, chest CT can further clarify the diagnosis. 4. Bronchiectasis: repeated cough, coughing up a lot of purulent sputum, repeated hemoptysis, and double-track sign in chest CT. It is recommended to go to the hospital in time to improve a series of related examinations, if necessary, bronchoscopy, to clarify the cause and exclude the possibility of malignant tumors.