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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.
3. Coughing up yellow mucus could be a sign of chronic bronchitis caused by smoking or hazardous work environment like coal mines or chemical factories. In this case the phlegm is especially thick and hard to cough up and might even restricting oxygen to lungs and cause characteristic blue lips. 4. Sinus infection is another reason for you to be coughing up yellow mucus that might also contain traces of blood, fever and a general feeling of listlessness. Stagnant mucus is an excellent breeding medium for bacteria that thrives in warm, dark sinus cavities.