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Mucus produced by the respiratory system (excluding the nasal passages)
Phlegm (; Ancient Greek: , phlégma, "inflammation", "humour caused by heat") is mucus produced by the respiratory system, excluding that produced by the nasal passages. It often refers to respiratory mucus expelled by coughing, otherwise known as sputum. Phlegm, and mucus as a whole, is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances. Its composition varies depending on climate, genetics, and state of the immune system. Its color can vary from transparent to pale or dark yellow and green, from light to dark brown, and even to dark grey depending on the constituents. The body naturally produces about 1 quart (about 1 litre) of phlegm every day to capture and clear substances in the air and bacteria from the nose and throat.
Distinction between mucus and phlegm
Contrary to popular misconception and misuse, mucus and phlegm are not always the same.
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.
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.
Nodules: Excessive yelling, screaming, and incorrect singing as well as other vocal abusive habits can cause vocal fold 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 is an excess amount of phlegm and is usually caused by a viral infection, and only bacterial infections, which are rare, are to be treated with an antibiotic.
Hay fever, asthma: In hay fever and asthma, inner lining in bronchioles become inflamed and create an excess amount of phlegm that can clog up air pathways.
Air pollution: In studies of children, air pollutants have been found to increase phlegm by drying out and irritating parts of the throat.
Excessive phlegm creation can be troublesome. There are basically two ways to get rid of excess phlegm: swallowing or spitting.
The alternative to swallowing would be throat-clearing. To do this, the mouth should be closed and air should be inhaled hard into the nose. Inhaling forcefully through the nose will pull excess phlegm and nasal mucus down into the throat, where muscles in the throat and tongue can prepare to eject it. Once this is done, a U-shape should be formed with the tongue, while simultaneously forcing air and saliva forward with the muscles at the back of the throat. At this point, the phlegm will be in the mouth and is now ready to be spat out as sputum.
Colors of phlegm
Phlegm can exist in different colors. The color could provide important clues about a person's health.
Yellow or green: Indicates an infection. The color is caused by an enzyme produced by the white blood cells combating the infection.
Red: Indicates dry air. A nasal spray can be used to alleviate symptoms of a dry nose and throat. It can also occur due to blood (such as if the person had or has a bleeding nose, or a lung malignancy).
Phlegm and humourism
Humourism is an ancient theory that the human body is filled with four basic substances, called the four humours, which are held in balance when a person is healthy. It is closely related to the ancient theory of the four elements and states that all diseases and disabilities result from an excess or deficit in black bile, yellow bile, phlegm, and blood. Hippocrates, an ancient Greek medical doctor, is credited for this theory, about 400 BC. It influenced medical thinking for more than 2,000 years, until finally discredited in the 1800s.
The phlegm of Humourism is far from the same thing as phlegm as it is defined today. Nobel laureate Charles Richet MD, when describing humorism's "phlegm or pituitary secretion" in 1910 asked rhetorically, "this strange liquid, which is the cause of tumours, of chlorosis, of rheumatism, and cacochymia - where is it? Who will ever see it? Who has ever seen it? What can we say of this fanciful classification of humours into four groups, of which two are absolutely imaginary?"
Illnesses related to phlegm
A piece of phlegm
Phlegm may be a carrier of larvae of intestinal parasites (see hookworm). Bloody sputum can be a symptom of serious disease (such as tuberculosis), but can also be a relatively benign symptom of a minor disease (such as bronchitis). In the latter case, the sputum is normally lightly streaked with blood. Coughing up any significant quantity of blood is always a serious medical condition, and any person who experiences this should seek medical attention.
Apophlegmatisms, in pre-modern medicine, were medications chewed in order to draw away phlegm and humours.
^Ferreira, Leslie Piccolotto; de Oliveira Latorre, Maria do Rosario Dias; Pinto Giannini, Susana Pimentel; de Assis Moura Ghirardi, Ana Carolina; de Fraga e Karmann, Delmira; Silva, Eliana Egerland; Figueira, Silmara (January 2010). "Influence of Abusive Vocal Habits, Hydration, Mastication, and Sleep in the Occurrence of Vocal Symptoms in Teachers". Journal of Voice. 24 (1): 86-92. doi:10.1016/j.jvoice.2008.06.001. PMID19135852.