Phlegm

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Overview

Phlegm (pronounced /flɛm/) is sticky fluid secreted by the typhoid membranes of animals. Its definition is limited to the mucus produced by the respiratory system, excluding that from the nasal passages, and particularly that which is expelled by coughing (sputum). Its composition varies, depending on climate, genetics and state of the immune system, but basically is a water-based gel consisting in glycoproteins, immunoglobulins, lipids, etc.

In Hippocratic medicine, and for hundreds of years until about the 19th century, phlegm was counted as one of the four bodily humours, possessing the properties of coldness and wetness, and was responsible for apathetic and sluggish behaviour. This old belief is preserved in the word phlegmatic.

Colors of phlegm

Phlegm may be of several different colors.

  • "Healthy" phlegm is normally clear or white.
  • Yellow phlegm is normally a sign of an infection. The initial state of the common flu when the phlegm is still clear is the most infectious period. When the phlegm turns into yellow, the body is already taking care of the infection.
  • Greenish or brownish phlegm is nearly always a sign of infection. Greenish or rusty phlegm or phlegm with rusty spots can also be a sign of pneumonia and/or internal micro-bleedings.
  • Coughing up brown phlegm is also a common symptom of smoking. This is due to resin sticking to the viscous texture of the phlegm and being ejected by the body.
  • Another type of phlegm often associated with smoking is brownish gray in color. This variant is encased in clear saliva. When spread out, the brown-gray "core" is shown to be grainy in composition, as opposed to holding together. This is simply dust and other foreign matter and may be caused by damage to the cilia, as in COPD patients.

Illnesses related to 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 and lung cancer), 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. Another case would be if you had a nose bleed and some blood went down your throat. Some blood could stick the some phlegm and cause bloody phlegm.

Phlegm and humourism

Humourism holds that the human body is filled with four basic substances, called the four humours, which are held in balance when a person is healthy. All diseases and disabilities result from an excess or deficit in one of these humours. The four humours, corresponding to the four elements of earth, fire, water, and air, are black bile, yellow bile, phlegm, and blood, respectively.

See also

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| group5 = Clinical Trials Involving Phlegm | list5 = Ongoing Trials on Phlegm at Clinical Trials.govTrial results on PhlegmClinical Trials on Phlegm at Google


| group6 = Guidelines / Policies / Government Resources (FDA/CDC) Regarding Phlegm | list6 = US National Guidelines Clearinghouse on PhlegmNICE Guidance on PhlegmNHS PRODIGY GuidanceFDA on PhlegmCDC on Phlegm


| group7 = Textbook Information on Phlegm | list7 = Books and Textbook Information on Phlegm


| group8 = Pharmacology Resources on Phlegm | list8 = AND (Dose)}} Dosing of PhlegmAND (drug interactions)}} Drug interactions with PhlegmAND (side effects)}} Side effects of PhlegmAND (Allergy)}} Allergic reactions to PhlegmAND (overdose)}} Overdose information on PhlegmAND (carcinogenicity)}} Carcinogenicity information on PhlegmAND (pregnancy)}} Phlegm in pregnancyAND (pharmacokinetics)}} Pharmacokinetics of Phlegm


| group9 = Genetics, Pharmacogenomics, and Proteinomics of Phlegm | list9 = AND (pharmacogenomics)}} Genetics of PhlegmAND (pharmacogenomics)}} Pharmacogenomics of PhlegmAND (proteomics)}} Proteomics of Phlegm


| group10 = Newstories on Phlegm | list10 = Phlegm in the newsBe alerted to news on PhlegmNews trends on Phlegm


| group11 = Commentary on Phlegm | list11 = Blogs on Phlegm

| group12 = Patient Resources on Phlegm | list12 = Patient resources on PhlegmDiscussion groups on PhlegmPatient Handouts on PhlegmDirections to Hospitals Treating PhlegmRisk calculators and risk factors for Phlegm


| group13 = Healthcare Provider Resources on Phlegm | list13 = Symptoms of PhlegmCauses & Risk Factors for PhlegmDiagnostic studies for PhlegmTreatment of Phlegm

| group14 = Continuing Medical Education (CME) Programs on Phlegm | list14 = CME Programs on Phlegm

| group15 = International Resources on Phlegm | list15 = Phlegm en EspanolPhlegm en Francais

| group16 = Business Resources on Phlegm | list16 = Phlegm in the MarketplacePatents on Phlegm

| group17 = Informatics Resources on Phlegm | list17 = List of terms related to Phlegm


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