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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.
Mucoid, mucopurulent or purulent sputum is thicker and often more sticky than normal sputum. This is partly due to the greater mucus production coupled with pus in the purulent types. Apart from the consistency, the color of purulent sputum may vary from white or gray to yellow, green, rust-colored or brown. It may also have a pink tinge (blood streaked) which may be due to a small quantity of blood.