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Colors of Mucus (Phlegm, Sputum). Phlegm may be clear (white), yellow/green, brown, grey, black, pink, orange, containing red streaks, or frothy. Phlegm is mucus (sputum) coughed up from the chest. It reveals inflammation in the respiratory organs below the vocal cords (voice box, windpipe, bronchi and lungs). From the color and density of phlegm, and accompanying symptoms, its cause may be suspected.
If the color of phlegm is dark yellow or green, it indicates the presence of pus or dead white cells in the phlegm mucus, a good indication that body is currently fighting off bacteria. Another reason for coughing up green phlegm and sputum, a combination of phlegm and spit, could be an indication of cystic fibrosis disease and should be discussed with your doctor.