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Mar 15, 17 · When it is caused by bacteria, you may notice yellow or green phlegm, nasal congestion, postnasal drip, and pressure in your sinus cavities Cystic fibrosis ThisDec 22, 17 · Allergies, asthma and often viral infections cause white phlegm or phlegm without a lot of color to it It really depends If it's associated with underlying inflammatory conditions like asthma or COPD, it might indicate your underlying issue isn't as controlled as it needs to be and your chronic disease management may need to be augmentedYellow mucus Coughing up yellow mucus can be a sign of a sinus infection, especially when the color changes to a dark yellow It can also be a sign of bronchitis if it is accompanied by the symptoms already described for bronchitis under Green mucus, above Yet when the air is very dry some persons produce a light yellow mucus What Does Mucus Color Mean Green Yellow Clear Phlegm What color mucus indicates a sinus infection