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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]
In adults and children age 2 and older, ... If you experience difficulty breathing, develop a severe cough, notice thick green or yellow mucus, run a fever, and/or feel extremely fatigued.
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.
The green color of mucus comes from the heme group in the iron-containing enzyme myeloperoxidase secreted by white blood cells as a cytotoxic defense during a respiratory burst. In the case of bacterial infection, the bacterium becomes trapped in already-clogged sinuses , breeding in the moist, nutrient-rich environment.
Also known as phlegm, mucus is made up of mostly water, but it also contains "remnants of skin-lining cells (epithelial cells), antimicrobial enzymes, proteins and inorganic salts," explains Nasseri.
Rhinorrhea is characterized by an excess amount of mucus produced by the mucous membranes that line the nasal cavities. The membranes create mucus faster than it can be processed, causing a backup of mucus in the nasal cavities. As the cavity fills up, it blocks off the air passageway, causing difficulty breathing through the nose.