Phlegm is usually clear or white. 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 ...

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

Common walking pneumonia symptoms to look out for include a sore throat, extreme fatigue, chest pain or discomfort, a low-grade fever, chills, coughing, sneezing, and headache, according to Cleveland ...