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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.
'Also, the colour of your phlegm can reveal how serious your infection is. 'If it's very discoloured, as in green or brown, or blood-stained, it's wise to seek medical advice from a pharmacist or your GP. Here, Dr Brewer reveals what your body may be trying to tell youâ¦.