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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.
"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 ...
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]
It is closely related to the ancient theory of the four elements and states that all diseases and disabilities result from an excess or deficit in black bile, yellow bile, phlegm, and blood. Hippocrates, an ancient Greek medical doctor, is credited for this theory, about 400 BC. It influenced medical thinking for more than 2,000 years, until ...
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 and will likely clear on its own.
A mucous rectal discharge may be blood-streaked. With some conditions, the blood can be homogenously mixed with the mucus, creating a pink goo. An example of this could be the so-called "red currant jelly" stools in intussusception. This appearance refers to the mixture of sloughed mucosa, mucus, and blood. [12]
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]
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