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

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 ...