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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.
The mucus or phlegm often varies in consistency and color ranging from yellow, green, brown, grey or may even contain blood. Coughing mucus and phlegm commonly occurs in the morning. If you are coughing up mucus and phlegm and it persists, consult your doctor. Constantly coughing mucus and phlegm can lead to nausea. Based on your cough symptoms, your doctor will perform a physical examination as well as certain diagnostic tests. Tests such as a chest x-ray, blood tests, sputum examination, ECG and CT exam may be ordered to rule out serious diseases such as TB or lung cancer.