Black mucus or phlegm is usually a sign of an underlying condition, smoking, or exposure to pollutants. Learn more about what causes black mucus and how to treat it.

Mucus can be several different colors, including green, yellow, and even black Doctors told DailyMail.com that most colors other than green aren't concerning READ MORE: What color are YOUR boogers?

“Nasal mucus that would necessitate a visit to your doctor may include frequent nosebleeds, nasal congestion that doesn’t go away, thick nasal mucus associated with facial pain, pressure, and smell ...

If your mucus is black for no obvious reason, you should see a doctor. This is especially true if you have a fever, chills, or have difficulty breathing. This article was first published on Jan 1 ...

Apparently post-Lolla black snot is likely to be mucus-trapped soot from stage fireworks, according to Dr. David Zich, an emergency medicine physician for Northwestern Medicine.

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 ...