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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.
Bright yellow or dark green. This is usually a sign of an infection, Parikh says. This is usually a sign of an infection, Parikh says. "People assume that this means they have a bacterial ...
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]
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 ...
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]
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.
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It is also thick over the nasal septum where increased numbers of goblet cells produce a greater amount of nasal mucus. It is very thin in the meatuses on the floor of the nasal cavities, and in the various sinuses. It is one of the most commonly infected tissues in adults and children.