Key takeaways
- Mucus traps particles and germs.
- Cilia sweep mucus upward.
- Smoke and dry air slow clearance.
- Water and movement help.
- The huff cough clears gently.
Mucus has a bad reputation, but it is one of your lungs' most important defences. Problems start when there is too much or it becomes too thick.
The mucociliary escalator
The sticky trap
A thin layer of mucus covers the airway walls and catches dust, pollen, smoke particles and germs before they reach the delicate air sacs.
The moving staircase
Underneath, millions of cilia beat in coordinated waves, pushing the mucus upward like an escalator.
The exit
The mucus reaches the throat, where it is swallowed without you noticing, or coughed out when there is more of it.
What slows it down, and what helps
| Slows clearance | Helps clearance |
|---|---|
| Smoking and vaping | Quitting smoke exposure |
| Dehydration | Drinking water through the day |
| Dry indoor air | Steam or a humidifier |
| Inactivity | Walking and deep breathing |
| Lying flat when congested | Raising your head at night |
The huff cough
Sit upright, take a medium breath, then breathe out forcefully with your mouth open as if fogging a mirror. Repeat 2 to 3 times, then cough once. This moves mucus up with less strain than repeated hard coughing. Some ingredients have been studied for their effect on mucus too: ivy leaf and the enzyme serratiopeptidase are both included in LungExpand Pro to support normal mucus clearance.
Sources
- Bustamante-Marin X.M. & Ostrowski L.E. – "Cilia and mucociliary clearance," Cold Spring Harbor Perspectives in Biology, 2017.
- Cleveland Clinic – "Mucus in the chest: causes and treatment."
- European Medicines Agency – "Hederae helicis folium" herbal monograph.
Common questions
How do the lungs get rid of mucus?
Tiny hairs called cilia sweep it up toward the throat, where it is swallowed or coughed out.
What makes mucus thick?
Dehydration, dry air, smoking and infections.
What is the huff cough?
A forceful open-mouth exhale that moves mucus up gently before a single cough.