Colds and coughing up sputum that is grayish-black in color may be due to inhalation of a large amount of dust or a bacterial infection in which the sputum is not discharged in a timely manner.
1. When the environment in which the organism lives contains a lot of dust, the dust may enter the respiratory tract, and the respiratory secretions increase during a cold and combine with the dust. When the secretions are coughed up by the organism, it is possible to manifest coughing up sputum that is grayish-black in color.
2. After bacterial infection, respiratory mucosal secretions increase. If the secretion is not discharged in time, it gathers and concentrates in the respiratory tract, and grayish-black sputum is formed.
Cold and cough sputum gray-black symptoms alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results in order to make an accurate judgment, it is recommended that the cause of the disease under the guidance of a doctor.