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 ...

If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust.

Being sick is scary enough, but add onto it the presence of black phlegm, and it can cause a lot more stress and questions.

This cold and flu season, you may be looking for clues you're getting better anywhere you can find them, even in the color of your snot.

This can cause your phlegm to contain traces of blood. Repeatedly coughing up phlegm often brings small amounts of blood into the mouth and onto the taste buds, leading to a distinct metallic ...

Black: This could be old, dried blood. The mucus can also turn black when environmental irritants, like dust particles, smoke or other air pollutants, get stuck in the nasal passages. Serious ...