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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 color of phlegm may point to the underlying cause of a throat condition and in case of infections it may also point to infective agent that has led to infection. White phlegm is most commonly a feature of viral infections.part from cough and white phlegm, patients may develop additional symptoms and signs of infection such as sore throat, itchy sensations in the throat, problems with swallowing, mild fever and loss of appetite. Cough can range from mild to severe.