"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 ...

When you’re sick, you’ll often produce more phlegm, and might notice it’s thicker or a different colour: white, green, yellow or maybe even brown. What can this phlegm – also called mucus, snot, ...

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 ...

Phlegm buildup in the lungs and throat is a common problem, especially during colds, allergies, pollution exposure, or respiratory infections. Phlegm is a thick mucus produced by the respiratory ...

Phoebe Williams receives funding from the National Health and Medical Research Council, the Medical Research Future Fund, and the Gates Foundation. Niall Johnston does not work for, consult, own ...