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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.
Blood-tinged sputum is expectorated mucous matter from the airways that is tinged or streaked with blood. The blood can be either bright red or dark red in color. Itâs also referred to as blood-streaked sputum, or sputum contains blood. Blood-tinged sputum is different from coughing up blood with or without very little sputum (hemoptysis). Hemoptysis can be a potentially life-threatening condition requiring immediate medical attention.