Mucus is your body’s natural defence, but too much of it can make breathing feel like you’re inhaling through a wet sponge. Your lungs produce mucus every day to trap dust, germs, and irritants.

Chest mucus, or phlegm, is a common symptom that often accompanies colds, flu, allergies, or respiratory infections. While mucus plays a protective role in trapping dust and pathogens, too much of it ...