If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust. Regular smokers can also blow out darker mucus because of the tar or other toxic ...

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.

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

you’ve likely examined your mucus color, from yellow to green, for signs you may be healing. “We are in the midst of one of the most severe flu seasons in the past few decades, and it is ...