Sputum is the signal of lung disease. What do black, yellow, white and red sputum represent respectively
Cough, sputum and other symptoms, I believe most people have experienced it. Some people even take medicine when they cough and they don't get better. It is said that phlegm is one of the signs of lung health. What do the different colors of phlegm represent? If I accidentally swallow the phlegm, is there any harm?
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