Brown mucus is a response to irritation or inflammation in the lungs and contains dead cells, old blood, debris, tobacco tar, or air pollutants. A range of factors and health conditions can cause ...

It’s that time of year again, when everyone’s fighting a cold and blowing their nose. Maybe you’ve found yourself having sinus struggles, or you’ve noticed your boogers don’t look ...

If you’re blowing your nose regularly, it’s hard not to notice your mucus—and what color it is. So it can also be alarming if you happen to spot yellow, brown, bloody, or green mucus in your ...

Learn more about the differences between mucus and phlegm, how to treat excess mucus, ... Brown or brown spots: This may be old blood from cystic fibrosis or other bacterial lung infections.