Mucus at Work Bacteria land on the mucus-lined surface of the lungs and get trapped. Then little hairs called cilia go to work. They push the mucus up and out of the lungs with all the trapped bacteria, viruses, and dust.
Cilia are mobile, tiny, finger-like projections on the surface of airway cells. Cilia line the airways and help move mucus up and out of the lungs [5].
Mucus in the lungs is known as phlegm or sputum. It is a common symptom in chronic lung diseases such as COPD (including chronic bronchitis and emphysema), cystic fibrosis, bronchiectasis, NTM lung disease or asthma.
If you're suffering from allergies, asthma or another condition that is causing excess mucus production, it's important to seek medical treatment. However, in cases where phlegm results from a viral infection, such as the common cold, it will usually resolve on its own within seven to 10 days.
So here's the big question: Should you spit or swallow your phlegm? Even though it might taste nasty, “there's nothing wrong with swallowing it,” Dr. Comer says. In fact, that's probably what your body expects you to do, which is why phlegm naturally drains down into the back of your throat.
Mucus: The Warrior
Coughing and blowing your nose are the best ways to help mucus fight the good fight. “Coughing is good,” Dr. Boucher says. “When you cough up mucus when you are sick, you are essentially clearing the bad guys—viruses or bacteria—from your body.”
To spit or swallow? I'm occasionally asked whether swallowing mucus produced with a respiratory infection is harmful. It's not; luckily the stomach works to neutralise bacteria and recycle the other cellular debris. Some people do report a queasy feeling in the stomach during such infections.
Vicks products cannot cure the cold or flu, but they can help relieve chest congestion symptoms so you can feel better while your body heals from the cold or flu virus. When you have chest congestion symptoms, the mucus build-up in your lungs can become very thick and dense.
These symptoms can be unpleasant, but they usually get better on their own in about 7 to 10 days. The cough and mucus can last up to 3 weeks.
You may notice that mucus from your runny nose has become thicker, with a yellow or green tinge. This usually is due to a spike in the number of white blood cells your immune system has dispatched to overcome the virus, according to the Mayo Clinic.
Though they're always at work, you typically only notice the sticky substances when you're sick. Mucus and phlegm are similar, yet different: Mucus is a thinner secretion from your nose and sinuses. Phlegm is thicker and is made by your throat and lungs.
It is a common symptom of conditions such as the common cold, sinusitis, and allergies. The excess mucus can be caused by inflammation or swelling of the nasal passages, which can be due to a variety of factors such as viral or bacterial infections, allergies, or irritants in the air.
While a cough itself isn't contagious, the germs that a cough spreads may be. Whether visible or not, each time someone coughs, very small particles are spread into the air. Sometimes these particles spread just a few inches, sometimes several feet.
“Normally, mucus is clear. When you have a cold or infection, it might turn green or yellow,” said Alyssa. Clear snot usually signals allergies or some kind of environmental factor that is triggering your nose to start running, such as inhaling dust or allergens. Clear snot is nothing to worry about.
When mucus starts to build up or trickle down the back of the throat, this is known as postnasal drip. Causes of postnasal drip include infections, allergies, and acid reflux. As well as feeling the need to clear the throat frequently, a person with postnasal drip may also experience: a sore throat.