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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.
Certain things like constipation can cause the yellow or white mucus in stool to be more obvious and apparent. After all, if passing stool is problematic and itâs becoming backed up, itâs likely then that yellow mucus may build up as well, and therefore make it more apparent upon evacuation.ucus color plays an important role in determining how uncomfortable the poop phlegm can make people. Bright yellow mucus can be startling, for instance. And, given the fact that the color yellow is often associated with infection or illness, seeing it coming out the backside can be instant cause for concern.