This is how your phlegm can tell you when you should see a doctor

Black mucus is rare. It can be the sign of a fungal infection, or exposure to pollutants such as coal, dust or cigarette ...
Cochrane

Mechanical breathing assistance for people with cystic fibrosis

NIPPV is a treatment where a machine is used to help the person breathe. During NIPPV therapy, the person breathes using a mask that forces the air into the lungs, keeping the airways open and ...