Phlegm, or sputum, is a slimy, slippery substance found in your throat and lungs ... notice phlegm until your body starts to produce too much of it due to an infection. Your airway glands create ...

Jassey, DOCoughing up thick, green mucus may mean a bacterial or, less often, viral infection, but that's not always true.

On his 59th birthday, Shah Rukh Khan announced that he had finally quit smoking.For someone who has been a regular smoker for ...