Mucus isn't exactly something people give much thought to — until they're sick and dealing with a constantly runny nose. But mucus is actually an important part of a healthy immune system, according ...

Clear, bubbly phlegm does not typically indicate a problem. However, coughing up large amounts could indicate an underlying health issue, such as fluid in the lungs. Phlegm, or sputum, is a type of ...

Your body produces mucus naturally to protect your respiratory system, and under normal circumstances, this protective fluid remains clear and relatively thin. However, when mucus suddenly changes to ...

DEAR DR. ROACH: Colds and flus seem to linger in my lungs and nose for a week or more after all other symptoms have passed. If my phlegm and mucus are clear or white and I otherwise feel healthy, am I ...

"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 ...

Although mucus and phlegm are related terms, they don't mean exactly the same thing. Karl Tapales via Getty Images Most people are all too familiar with the icky, uncomfortable feeling of having mucus ...

The lungs cleanse themselves by producing mucus, which traps pollutants and germs. People can clear this mucus by coughing or clearing the throat. Avoiding breathing in cigarette smoke, air pollution, ...