In polite circles and among health care professionals, they tend to call it mucus. Some call it phlegm. Others may simply call it snot.
No matter which word you use, when you have a cold or flu, you usually have an increased supply of it. At your sickest, your sinuses may rev up production almost as fast as you can clear the stuff away.
Still, doctors say, all that gunk in your nose really does have a role in the body and a useful purpose during a cold.
Mucus in the nose and sinuses forms...Full Story