MUCUS
Mucus is a normal protective layering around the airway, eye, nasal turbinate, and uro-genital
tract. Mucus is an adhesive visco-elastic gel produced in the airway by sub-mucosal
glands and goblet cells and is principally water. It also contains high-molecular weight
mucous glycoproteins that form linear polymers.
PHLEGM
Phlegm is more related to disease than is mucus and can be troublesome for the individual to
excrete from the body. Phlegm is a juicy secretion in the airway during disease and
inflammation. Phlegm usually contains mucus with virus, bacteria, other debris, and sloughed-
off inflammatory cells. Once phlegm has been expectorated by a cough it becomes sputum.
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EXCESSIVE PHLEGM CREATION
There are multiple factors that can contribute to an excess of phlegm in the throat or larynx.
Vocal abuse: Vocal abuse is the misuse or overuse of the voice in an unhealthy fashion
such as clearing the throat, yelling, screaming, talking loudly, or singing incorrectly.
Clearing the throat: Clearing the throat removes or loosens phlegm but the vocal cords
hit together causing inflammation and therefore more phlegm.
Yelling/screaming: Yelling and screaming both cause the vocal cords to hit against each
other causing inflammation and phlegm.
Nodules: Excessive yelling, screaming, and incorrect singing as well as other vocal
abusive habits can cause vocal nodules. See vocal fold nodule for more information on
nodules.
Smoking: Smoke is hot, dry, polluted air which dries out the vocal cords. With each
breath in of smoke, the larynx is polluted with toxins that inhibit it from rehydrating for
about 3 hours. The vocal cords need a fair amount of lubrication and swell from
inflammation when they do not have enough of it. When the vocal folds swell and are
inflamed, phlegm is often created to attempt to ease the dryness.
Experiment on smoking correlations: In 2002, an experiment was done and published by
the American College of Chest Physicians to find if there was a correlation of smokers
with coughing and phlegm. In the study, 117 participants were studied, a mix of current
smokers, ex-smokers, non-smokers, and a positive control of participants with a disease,
COPD (Chronic Obstructive Pulmonary Disease.) At the end of the experiment,
experimenters found that there was a high correlation between phlegm and cough with
smoking of 0.49 (p < 0.001.)
Illness: During illness like the flu, cold, and pneumonia, phlegm becomes more excessive
as an attempt to get rid of the bacteria or viral particles within the body. A major illness
associated with excess phlegm is acute bronchitis. A major symptom of acute bronchitis