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A fungal infection or polluted air can cause brown or black mucus, according to Nasseri. ... have a little bit of gray or smoky tinge to their phlegm because of the smoking." If you have symptoms ...
Mucormycosis, also known as black fungus, [3] [4] is a severe fungal infection [11] that comes under fulminant fungal sinusitis, [12] usually in people who are immunocompromised. [ 9 ] [ 13 ] It is curable only when diagnosed early. [ 12 ]
Mucus has trillions of microbes and is a first line of defense against microorganisms that cause infections, the NIH says. "Mucus is very helpful in terms of our immune system," Elliott says.
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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.
However, some researchers argue that the flow of mucus down the back of the throat from the nasal cavity is a normal physiologic process that occurs in all healthy individuals. [1] Some researchers challenge post-nasal drip as a syndrome and instead view it as a symptom, also taking into account variation across different societies.
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Developing a chronic cough can occur from different lifestyle choices. These include smoking cigarettes that the individual smokes themselves or breathes from second-hand exposure. [20] Long-term exposure to smoke can irritate airways and lead to chronic cough and in severe cases lung damage. Other risk factors include exposure to polluted air ...