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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.
This means that the inflammation of the air passages is due to an infection. Coughing up yellow to yellowish brown phlegm is common in most acute respiratory conditions. It is actually the presence of certain immune cells, the white blood cells such as neutrophils and eosinophils, that phlegm may take on a yellow color.nfections of the respiratory passages is the most common cause of coughing up of phlegm. Most cases are acute and resolve without any complications. 1  Acute bronchitis is usually bacterial in nature and tends to develop after the common cold or flu. 2  It is more frequently seen in cigarette smokers.