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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.
Normal, clear sputum is a serous discharge. Large amounts of clear, frothy or pink sputum that is of a similar consistency as normal sputum may be a sign of pulmonary edema, which is an accumulation of fluid in the lungs. If it extremely profuse and lasting for weeks or months, then it may be due to lung cancer.