People often only really notice mucus’ existence when they have a health issue. When you are suffering from a virus or bacterial infection, your body can produce excess amounts of mucus and it can go from its normal colourless state to being yellow or green. At the peak of an infection, mucus will be dark green, and will gradually turn lighter shades until it returns to being colour.

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Phlegm is actually not the same as mucus. It’s a combination of mucus, bacteria, dead cells from inflamed tissue and debris and is only in the body in times of any inflammation or illness.

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