Gray Mucus?

Answer

Mucus that is coughed up from the chest is called sputum or phlegm. There are a number of different reasons for coughing this up and the color of it may help narrow down those reasons. For instance, you may cough up clear mucus when you have a chest cold or bronchitis or even asthma. You may couch up a thick, white mucus during a bout of reflux or after drinking milk. Grey mucus is not that significant. Grey mucus is most likely caused by air pollution or smoking.
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The color of sputum or phlegm, which is the mucus expectorated from the respiratory tract, is often an indication of the type of respiratory disease that gives ...
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