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

However, according to experts, phlegm coming out without feeling sick could indicate a more serious underlying issue like heart or lung disease. Also, you may notice different colored sputum and ...

To many people, mucus is nothing more than a gross goo, something to be tossed away in a tissue immediately after clearing your throat or blowing your nose. To scientists, it’s nothing short of ...