Coughing up sputum at night is black, which may be caused by smoking or environmental pollution, or may be caused by disease factors.
1. Smoking: long-term smoking patients respiratory tract can be adsorbed part of the black tar, vagus nerve excitation at night, tracheal contraction, the patient’s respiratory tract is stimulated by coughing up sputum.
2. Environmental pollution: If the patient’s environment is heavily polluted, black dust will be attached to the surface of the patient’s respiratory tract, and will be discharged with the sputum when coughing at night, making the sputum black.
3. Disease factors: such as pneumococcal pneumonia, bronchodilatation, pulmonary embolism, tuberculosis, lung cancer, Klebsiella pneumonia, pharyngeal hemorrhage and other diseases, respiratory bleeding caused by black sputum.
Patients coughing sputum is black at night, it is recommended to go to the hospital in time, to clarify the cause, under the guidance of the doctor for the cause of the treatment.