There is no identification of black phlegm in Chinese medicine. Black phlegm may be mixed with pus and blood and make the color black, or consume black medicines or food leading to the formation of phlegm staining. Phlegm is a kind of pathological mucus, which is mainly discharged from the airways and lungs. By observing the quantity, quality and color of phlegm, we can judge the nature of the disease and the lesions of the internal organs. Cold phlegm, mainly manifested by white sputum and thin sputum, is mainly caused by cold evil obstructing the lungs, and the fluids are abnormally condensed into phlegm; or the spleen yang is insufficient, and the water and dampness stops to gather into phlegm, which is then committed to the lungs. Hot phlegm, with phlegm sticky and thick, phlegm color yellow, or even lumps as the main manifestation, mainly due to the evil heat against the lungs, exhausting and burning the fluids into phlegm, and phlegm stagnation in the lungs. Dry phlegm, with phlegm viscous and little, difficult to cluck out as the main manifestation, mainly due to lung yin deficiency and fluid deficiency, clearing and purging dereliction of duty, or dryness of evil spirits against the lungs, the depletion of lung fluids caused by. Damp phlegm, with phlegm slippery, white color, large amount, easy to cluck out as the main manifestation, mainly due to the spleen healthy transport failure, water and dampness abnormal stay, dampness gathered into phlegm, and committed to the lungs. In addition, there is hemoptysis, generally manifested as bright red color, blood in the sputum, common in lung cancer, consumption and other lung diseases, mostly due to phlegm heat, evil poison congestion, damaged lungs; or liver fire against the lungs and lung yin deficiency (lack of yin in the lungs), fire and heat burns the lungs caused by the evil gas. Lung carbuncle, generally manifested as vomiting pus and blood sputum with a foul odor. It is mainly caused by poisonous heat that accumulates in the lungs, and the flesh rotting into pus. The identification of phlegm is mainly the above cases, but does not exclude other more rare manifestations. Clinical diagnosis must be made by a professional doctor, targeted treatment.