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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.
However, in certain conditions, particularly related to irritation of the respiratory tract, the amount of sputum may become excessive. In these pathological cases, the color, texture and even odor of the sputum may change. These variations may give an indication of the possible cause.