involves coughing or spitting up blood or blood-streaked mucus from your respiratory tract (i.e. lungs and airways). Coughed-up blood may appear pink, bright red, or rust-colored, and there may be ...

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 ...