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

A higher-than-normal amount of phlegm can build up in your nose, throat, and lungs when you are sick. This build-up may cause coughing and discomfort. Bloody, brown, white, yellow, or green phlegm ...

Whether it's allergies or sickness, your white blood cells and certain molecules are being called up ... snot is yellow and thick, it is more likely to be a viral infection so consider staying home ...

Exposure to mycobacterium avium complex (MAC) infection happens because of contaminated water or soil. Learn who gets severe ...