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 ...
“If you have a nagging cough that causes you to wake up often throughout the ... the cilia [little ‘hairs’ in our lungs] to more effectively move mucus out of the lungs, and the cough ...
Phlegm can build up at the back of your throat when you lie down in bed and trigger coughing at night ... says wet coughs can also be caused by chronic lung conditions such as chronic bronchitis ...