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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.
Sputum or phlegm is the discharge that is expectorated from the respiratory system. It is a combination of mucus produced by the airways combined with saliva from the mouth. It also contains other components including microorganisms, whole cells (like the immune cells), debris and dust even if there is no respiratory disease present.