If your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust.

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 ...

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

When a white blood cell finds a germ, it latches onto it. Then it changes its shape to surround the germ. You can imagine the ...

White mucus can be caused by: A virus or other pathogen. However, respiratory tract mucus (sputum) infected with bacteria ...

First, it’s important to know that fish are covered in a thin layer of mucus. This slimy coating (it is also called a “slime coat”) is known to keep fish healthy by warding off pathogens.

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 ...