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 your snot.

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 ...

Fact checked by Nick Blackmer Extra mucus in your throat and chest is a common symptom of respiratory viruses, such as the ...

Mucus serves an important purpose in the nasal passages and other cavities throughout the body. It helps protect against infection and harm from foreign objects. It also helps lubricate these ...

Pope Francis suffered two episodes of acute respiratory failure Monday, the Vatican said, a fresh setback in the worst health ...

But can you really tell what kind of illness you have or where you are in your infection based on your mucus? Here’s a breakdown of what goes on inside our body when we’re sick and why mucus ...