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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.
1 Bloody (hemoptysis). 2  Blood-streaked sputum â inflammation of throat, bronchi; lung cancer; 3  Pink sputum â sputum evenly mixed with blood, from alveoli, small bronchi; 4  Massive blood â cavitary tuberculosis of lung, lung abscess, bronchiectasis, infarction, embolism.putum ['spju.tÉm] is mucus that is coughed up from the lower airways. This process is known as sputilization. In medicine, sputum samples are usually used for microbiological investigations of respiratory infections and cytological investigations of respiratory systems.