Dark red sputum often indicates that there is blood in the sputum, and a variety of diseases can cause patients to spit out dark red sputum early in the morning, such as bronchiectasis, pneumonia, lung cancer and nasopharyngeal diseases, and so on. 1. Bronchial dilatation: Bronchial dilatation patients have thinned walls of the airways, and the surrounding blood vessels are prone to rupture, resulting in the symptom of spitting dark red sputum. 2. Pneumonia: if the patient is accompanied by serious lung infection, it may cause the blood vessels in the respiratory tract to rupture and bleed, which may also lead to the symptom of spitting out dark red sputum in the morning. 3. Lung cancer: as cancer cells will erode the surrounding tissues, when the surrounding blood vessels are damaged, it will also lead to bleeding. 4. Nasopharyngeal diseases: if the nasal cavity ruptures and bleeds at night, or the mouth bleeds, the blood flows into the trachea during sleep, so that the patient coughs up the symptom of dark red sputum. Spitting up dark red sputum early in the morning may also be other reasons, if this symptom occurs for a long time, it is recommended to consult a doctor for a clear diagnosis and timely treatment.