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.

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 ...