If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker mucus because of the tar or other toxic ...

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

Medically reviewed by Monique Rainford, MD Cervical mucus is a natural vaginal fluid that the cervix (structure at the bottom ...

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 ...

However, did you know that mucus production actually helps the lungs by trapping irritants such as dirt and dust, and infectious particles such as bacteria or viruses? These are then passed out of ...