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

Medically reviewed by Sanja Jelic, MD Mycobacterium avium complex (MAC) is group of organisms causing a bacterial infection that leads to lung disease. MAC is noncontagious and made up of ...

Those symptoms are typically the same whether you are in the throes of seasonal allergies or a battle against a viral ...