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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.
Green phlegm is an indication that your body is fighting off a more serious infection. While the green color may be alarming, it is a natural byproduct of the immune system activity necessary to fight off the infection. Consider seeing your doctor if your other symptoms are getting worse. Red. Red or pink phlegm can be a more serious warning sign.