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Like with green snot, yellow snot is the collection of defensive white blood cell secretions. Generally, the greener the color, the more cells required for defense. The yellower, the fewer.
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]
"You can have bright yellow, dark green mucus, even with viruses." Pink or red. This typically means there's blood in your mucus, Elliott says, "usually because the nasal passages are too dry and ...
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.
In general, nasal mucus is clear and thin, serving to filter air during inhalation. During times of infection, mucus can change color to yellow or green either as a result of trapped bacteria [24] or due to the body's reaction to viral infection. For example, Staphylococcus aureus infection may turn the mucus yellow. [25]
If your mucus is yellowish… Yellowish mucus typically means that your white blood cells are "fighting off an illness or infection," says Nasseri. "Most commonly this is linked to the common cold ...
The word "gringo" did not originate during the Mexican–American War (1846–1848) as a corruption of "Green, go home!", in reference to the green uniforms of American troops. The word originally simply meant "foreigner", and is probably a corruption of the Spanish word griego for "Greek" (along the lines of the idiom "It's Greek to me ").
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