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Yellow or green: Indicates an infection often by a virus or bacteria. The color is caused by an enzyme produced by the white blood cells combating the infection. Clear: Indicates allergies. Mucous membranes produce histamines and make more phlegm. Red: Indicates dry air. A nasal spray can be used to
"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 ...
Mucus isn't exactly something people give much thought to — until they're sick and dealing with a constantly runny nose. But mucus is actually an ... only yellow for less than a week to 10 days ...
If you are experiencing nasal congestion, a decongestant (like Sudafed) may work better for you. ... If you experience difficulty breathing, develop a severe cough, notice thick green or yellow ...
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 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]