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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.
Tweet. The color of sputum or phlegm, which is the mucus and sometimes pus discharge expectorated from the respiratory tract, is often an indication of the type of respiratory disease that gives rise to sputum production.ith infections, the green sputum will be more purulent (large amounts of pus) while in non-infectious inflammatory conditions, the green sputum will be more mucoid (large amounts of mucus). 1  Pneumonia â white, yellow or green. 2  Lung abscess â green, sudden accumulation of large amount of sputum if the abscess ruptures.