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Yellow phlegm in particular can scream infection. But, interestingly enough, the color does not come from infection. A yellow hue to the mucus is caused from white blood cells, according to Health.com. So, yellow mucus therefore isnât a result of an infection, but a result of the body fighting an infection. Coughing up yellow mucus therefore can be associated with battling the illness as opposed to being a symptom.
Varies: Phlegm color can vary: sometimes it can be yellow, sometimes it can be white, sometimes it can be clear. bad color types, so to speak, are like brown, dark green, or even bloody. If anything like this comes up, especially with fever, you should see your doctor right away. ...