Mucus, or phlegm, is a thick, slippery substance secreted by glands and cells in your body. Its important to your immune system because it traps microorganisms, dirt, and other particles that shouldnt ...

Add Yahoo as a preferred source to see more of our stories on Google. There's no way around it: Coughing up phlegm feels gross, especially if you're already dealing with other unpleasant symptoms from ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." It’s never any fun feeling under the weather, but when a common cold is paired with excess phlegm, it ...