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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.
The following write-up on phlegm color meaning provides information on what the color of phlegm says about the health of an individual. Advertisement. Phlegm refers to congealed mucus that is secreted by the mucous membranes of the respiratory tract. Coughing Up White or Gray Phlegm. White or gray phlegm can indicate upper respiratory tract infection or sinus congestion. Other significant causes of white mucus are: It is important to note that having milk or dairy products does not lead to production of white phlegm.