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Having green, yellow, or thickened phlegm (sputum) does not always indicate the presence of an infection. Also, if an infection is present, the color of the phlegm (sputum) does not determine whether a virus, a bacterium or another pathogen has caused it. Simple allergies can also cause changes in the color of the mucus. [1]
A fungal infection or polluted air can cause brown or black mucus, according to Nasseri. "Charcoal or sooty looking phlegm is often seen in people who work in coal mines and factories, or are ...
“Allergies, asthma, and often viral infections cause white phlegm or phlegm without a lot of color to it,” says Dr. Parsons. Depending on the condition, chronic disease management may be ...
Phlegm is more related to disease than mucus, and can be troublesome for the individual to excrete from the body. Phlegm is a thick secretion in the airway during disease and inflammation. Phlegm usually contains mucus with virus, bacteria, other debris, and sloughed-off inflammatory cells.
A number of the viruses that cause the common cold may also result in asymptomatic infections. [25] [26] The color of the mucus or nasal secretion may vary from clear to yellow to green and does not indicate the class of agent causing the infection. [27]
In the case of a viral infection such as cold or flu, the first stage and also the last stage of the infection cause the production of a clear, thin mucus in the nose or back of the throat. As the body begins to react to the virus (generally one to three days), mucus thickens and may turn yellow or green.
Phlegm can lead to congestion, coughing, and breathing problems. We spoke to medical experts on the causes, symptoms, and treatments of phlegm.
Post-nasal drip (PND), also known as upper airway cough syndrome (UACS), occurs when excessive mucus is produced by the nasal mucosa.The excess mucus accumulates in the back of the nose, and eventually in the throat once it drips down the back of the throat.
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