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

Phlegm might seem like an everyday nuisance, but it can serve as a critical indicator of your body’s respiratory and systemic ...

Coughing up white mucus can mean you have congestion with a respiratory infection such as bronchitis, or it can be a symptom ...

A little bit of blood in your phlegm will make the phlegm look red or pink, and it usually means that the frequent coughing has irritated your respiratory tract. As an upper respiratory infection ...

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 ...