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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.
Phlegm is a mucus-like substance produced by the lower airways, such as the lungs and the respiratory system leading to the lungs, not by the nose and sinuses, which produce the mucus that streams out of or clogs up your nose. You may not notice phlegm unless you cough it up as a symptom of bronchitis or pneumonia.As is the case with mucus, phlegm that has a color such as green or yellow may indicate infection. Any time you see blood in the phlegm you cough up, you should seek medical attention. 3.ou may not notice phlegm unless you cough it up as a symptom of bronchitis or pneumonia. As is the case with mucus, phlegm that has a color such as green or yellow may indicate infection. Any time you see blood in the phlegm you cough up, you should seek medical attention.