Black phlegm is rare and can be caused by inhaling pollutants like smoke, soot, or industrial chemicals that settle in the airways. Once exposure ends, phlegm usually returns to its normal color.

Mucus is a thin, slippery fluid that lines the nose, throat, and other passages to trap dust and germs. Phlegm is a thicker type of mucus produced in the lungs to catch and remove harmful particles ...

When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves an ...

Disgusting though they may be, phlegm is nothing to sneeze at. Here’s what its color and appearance can tell you about your health, and how to get rid of phlegm. Admit it: After you blow your nose or ...