Phlegm might seem like an everyday nuisance, but it can serve as a critical indicator of your body’s respiratory and systemic ...

When a white blood cell finds a germ, it latches onto it. Then it changes its shape to surround the germ. You can imagine the ...

An upper respiratory infection is a viral infection that passes from one person to another, irritating the nose, throat, and lungs. It often comes with congestion and a nagging cough. The phlegm ...

Mucus is a substance that lines the moist surfaces of your body, like your lungs and sinuses, and helps your body fight illness. Experts say it’s better to spit out excess mucus when you’re ...